File: configure.ac

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dnl
dnl This file is part of Rheolef.
dnl
dnl Copyright (C) 2000-2018 Pierre Saramito 
dnl
dnl Rheolef is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2 of the License, or
dnl (at your option) any later version.
dnl
dnl Rheolef is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with Rheolef; if not, write to the Free Software
dnl Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
dnl =========================================================================
dnl
dnl configure.in: script source file
dnl
dnl author: Pierre.Saramito@imag.fr
dnl
dnl date: 14 january 1999
dnl
dnl note: enter 'make INSTALL' to extract installation documentation
dnl
dnl #P:INSTALL
dnl #NAME: Installing @PACKAGE@ (@PACKAGE@-@VERSION@)
dnl #@cindex  installing
dnl #@pindex  configure
dnl #@toindex Makefile
dnl #
dnl #READING THE DOCUMENTATION:
dnl #@fiindex @file{.info} GNU info
dnl #@toindex @code{info}
dnl #@fiindex @file{.ps} postscript
dnl #@toindex @code{ghostview}
dnl #@fiindex @file{.1}, @file{.3},... unix manual pages
dnl #@toindex @code{man}
dnl #
dnl #@noindent
dnl # Rheolef comes with three documentations:
dnl #
dnl #@noindent
dnl #  @itemize @bullet
dnl #  @item an users guide with a set of complete examples (two volumes)
dnl #  @item a reference manual for unix commands an C++ classes
dnl #  @item the full browsable source code in html format
dnl #  @end itemize
dnl #
dnl #@noindent
dnl # All these documentations are downloadable in various formats from the Rheolef home page.
dnl # These files are also locally installed during the @code{make install} stage. See
dnl #@example
dnl #	rheolef-config --docdir
dnl #@end example
dnl #@noindent
dnl # The users guide is generated in @code{pdf} format:
dnl #
dnl #@example
dnl #@cartouche
dnl #  evince http://ljk.imag.fr/membres/Pierre.Saramito/rheolef/rheolef.pdf
dnl #  evince http://ljk.imag.fr/membres/Pierre.Saramito/rheolef/rheolef2-dg.pdf
dnl #@end cartouche
dnl #@end example
dnl #
dnl #@noindent
dnl # The reference manual is generated in @code{html} format:
dnl #
dnl #@example
dnl #  firefox http://ljk.imag.fr/membres/Pierre.Saramito/rheolef/rheolef-refman.html
dnl #@end example
dnl #
dnl #@noindent
dnl #and you could add it to your bookmarks.
dnl # Moreover, after performing @code{make install}, unix manuals are available for commands and classes:
dnl #
dnl #@example
dnl #  man field
dnl #  man 2 field
dnl #@end example
dnl #
dnl #@noindent
dnl # The browsable source code is generated in @code{html} format:
dnl #
dnl #@example
dnl #  firefox http://ljk.imag.fr/membres/Pierre.Saramito/rheolef/source_html/files.html
dnl #@end example
dnl #
dnl #INSTALLING FROM SOURCE AS ROOT USER:
dnl #@example
dnl #@cartouche
dnl #  ./configure
dnl #  make
dnl #  sudo make install
dnl #@end cartouche
dnl #@end example
dnl #
dnl #@toindex @code{make}
dnl #@noindent
dnl # By default, the installation directory is @file{/usr/local}.
dnl # Commands are in @file{/usr/local/bin}, libraries in @file{/usr/local/lib},
dnl # header files in @file{/usr/local/include} and others file in @file{/usr/local/share}.
dnl #
dnl #USING AND ALTERNATIVE INSTALLATION DIRECTORY:
dnl #@toindex @code{sh}
dnl #@toindex @code{bash}
dnl #@toindex @code{csh}
dnl #@noindent
dnl # The default install prefix is @file{/usr/local}.
dnl # If you are not the root user, or do not have its password,
dnl # you could prefer an alternative directory, e.g. @file{HOME/sys}.
dnl # You should enter:
dnl #
dnl #@example
dnl #  ./configure --prefix=$HOME/sys
dnl #@end example
dnl #
dnl #@noindent
dnl # In that case, you have to add the following lines at the end
dnl # of your @file{.profile} or @file{.bash_profile} file:
dnl #
dnl #@example
dnl #  export PATH="$HOME/sys/bin:$PATH"
dnl #  export LD_LIBRARY_PATH="$HOME/sys/lib:$LD_LIBRARY_PATH"
dnl #  export MANPATH="$HOME/sys/man:$MANPATH"
dnl #@end example
dnl #
dnl #@noindent
dnl # Assuming you are using the @code{sh} or the @code{bash} unix interpreter.
dnl # Conversely, if you are using @code{csh} or @code{tcsh}, add
dnl # at the bottom of your @file{.cshrc} file:
dnl #
dnl #@example
dnl #  set path = ($HOME/sys/bin $path)
dnl #  setenv LD_LIBRARY_PATH "$HOME/sys/lib:$LD_LIBRARY_PATH"
dnl #  setenv MANPATH "$HOME/sys/man:$MANPATH"
dnl #@end example
dnl #
dnl #@noindent
dnl # If you are unsure about unix interpreter, get the SHELL value:
dnl #@example
dnl #  echo $SHELL
dnl #@end example
dnl #
dnl #@noindent
dnl # Then, you have to @code{source} the modified file, e.g.: 
dnl #
dnl #@example
dnl #  source ~/.bashrc
dnl #@end example
dnl #
dnl #@toindex hpux, operating system
dnl #@pindex rheolef-config
dnl #@noindent
dnl # hpux users should replace @code{LD_LIBRARY_PATH} by @code{SHLIB_PATH}.
dnl # If you are unsure, get the shared library path variable:
dnl #
dnl #@example
dnl #  rheolef-config --shlibpath-var
dnl #@end example
dnl #
dnl #@noindent
dnl # Check also your installation by compiling a sample
dnl # program with the installed library:
dnl #
dnl #@example
dnl #  make installcheck
dnl #@end example
dnl #
dnl #@noindent
dnl # Since it is a common mistake, you can later, at each time, test
dnl # your run-time environment sanity with:
dnl #
dnl #@example
dnl #  rheolef-config --check
dnl #@end example
dnl #
dnl #REQUIERED LIBRARIES:
dnl #@noindent
dnl # The following required libraries are available as precompiled packages under
dnl # Debian GNU/Linux and Ubuntu systems.
dnl #
dnl #@toindex boost, extensions of the c++ standard template library
dnl #@table @code
dnl # @item a)
dnl # The @code{boost} library.
dnl # It provides useful extensions of the c++ standard template library.
dnl # See @url{http://www.boost.org}.
dnl #
dnl #@toindex armadillo, basic linear algebra subroutines
dnl # @item b)
dnl # The @code{armadillo} library.
dnl # It provides efficient c++ linear algebra subroutines. 
dnl # See @url{http://arma.sourceforge.net}.
dnl #@end table
dnl #
dnl #OPTIONAL HIGHLY RECOMMENDED LIBRARIES:
dnl #@toindex umfpack, multifrontal sparse direct solver
dnl #@table @code
dnl # @item a)
dnl # The @code{umfpack} library provides a multifrontal sparse direct solver.
dnl # Rheolef solvers run faster when using this library.
dnl # See @url{http://faculty.cse.tamu.edu/davis/suitesparse.html}.
dnl #
dnl #@toindex cgal, computational geometry library
dnl # @item b)
dnl # The @code{cgal} library provide an easy access to efficient and reliable geometric algorithms.
dnl # With it, Rheolef implements the characteristic method and interpolation from one mesh to another.
dnl # This library is optional, but allows, when available, extended Rheolef features.
dnl # See @url{http://www.cgal.org}.
dnl #@end table
dnl #
dnl #OPTIONAL DISTRIBUTED AND PARALLEL LIBRARIES:
dnl # With the optional following libraries, Rheolef is able to run in parallel and
dnl # and with distributed memory.
dnl # By default, the Rheolef @code{configure} script tries to autodetect these
dnl # libraries and be able to run in parallel. 
dnl # When these libraries are not found, the distributed features are turned off.
dnl # If your libraries are installed in a non-standard location, you should
dnl # indicate it by a suitable @code{configure} option. See below for these options.
dnl #
dnl #@table @code
dnl #@toindex mpi, message passing interface
dnl # @item a)
dnl # Rheolef bases on @code{mpi}, the message passing interface standard.
dnl #
dnl #@toindex mumps, multifrontal massively distributed sparse direct solver
dnl #@cindex multifrontal linear solver
dnl #@cindex sparse matrix
dnl # @item b)
dnl # @code{mumps} is a massively distributed sparse direct solver.
dnl # The use of implicit numerical schemes leads to the 
dnl # resolution of large sparse linear systems.
dnl # Rheolef installation optionally requires
dnl # @code{mumps} is available at @url{http://graal.ens-lyon.fr/MUMPS} .
dnl #
dnl #@toindex scotch, mesh partitioner
dnl #@toindex metis, mesh partitioner
dnl # @item c)
dnl # Rheolef bases either on @code{scotch} or @code{metis} for distributed mesh partitioning. 
dnl # @code{scotch} is available at @url{http://www.labri.fr/perso/pelegrin/scotch}.
dnl # @code{metis} is available at @url{http://www.cs.umn.edu/~metis}.
dnl #
dnl #@toindex trilinos, large-scale object-oriented solvers framework
dnl # @item d)
dnl # Rheolef installation optionally uses
dnl # @code{trilinos/ifpack} as a library of preconditioner used for iterative solvers.
dnl # @code{trilinos} is available at @url{http://trilinos.sandia.gov} .
dnl # When @code{trilinos} is not available, a less efficient builtin IC0 preconditioner is used.
dnl #@end table
dnl #
dnl #RUN-TIME OPTIONAL TOOLS:
dnl #
dnl #@toindex @code{gmsh}
dnl #@toindex @code{gnuplot}
dnl #@toindex @code{mayavi2}
dnl #@toindex @code{paraview}
dnl #@noindent
dnl # Using Rheolef suggests the use of the following optional tools
dnl # for pre- and post-processing purpose:
dnl #
dnl #@example
dnl #  gmsh
dnl #  gnuplot
dnl #  paraview
dnl #  mayavi2
dnl #@end example
dnl #
dnl #@noindent
dnl # None of these tools are required when building and installing Rheolef. 
dnl #
dnl #BUILD-TIME EXTRA TOOLS FOR RHEOLEF DEVELOPERS:
dnl #
dnl #@toindex ginac, not a computer algebra system
dnl #@noindent
dnl # These tools are required if you build from the development version (under CVS).
dnl # Re-generating some source files, as initiated with the "bootstrap" command,
dnl # requires autotools @code{autoconf}, @code{automake} and @code{libtool}
dnl # and also @code{flex} and @code{bison}.
dnl # It requires also @code{ginac} for polynomial basis management.
dnl # @code{ginac} is available at @url{http://www.ginac.de} .
dnl # It requiers finaly latex figure management tools to.
dnl # Here is the @code{apt-get} commands to install these tools under Debian GNU/Linux and Ubuntu:
dnl #
dnl #@example
dnl #  apt-get install cvs autoconf automake libtool
dnl #  apt-get install flex bison
dnl #  apt-get install pkg-config libginac-dev ginac-tools
dnl #  apt-get install ghostscript gnuplot xfig transfig imagemagick graphviz
dnl #@end example
dnl #
dnl #PORTABILITY ISSUES:
dnl #@cindex  standard template library (STL)
dnl #@noindent
dnl # Rheolef is based on STL and its extensions, the BOOST library. Therefore you need a compiler
dnl # that supports the ANSI C++ standards. STL and Rheolef especially depend
dnl # heavily on the template support of the compiler.
dnl # The C++ 2011 standard features are recommanded but still optional:
dnl # when available, it allows extended features, e.g. an elegant matrix concatenation syntax via
dnl # the @code{std::initializer_list} class.
dnl #
dnl #@toindex gnu c++ compiler
dnl #@toindex intel c++ compiler
dnl #@noindent
dnl # Current distributed version of Rheolef has been heavily tested with GNU C++, CLANG C++
dnl # and INTEL C++ on debian, ubuntu, mint, suse and redhat GNU/Linux systems for various 32 and 64 bits
dnl # architectures, up to 200 distributed memories and processes.
dnl # Successful installation from sources on MAC-OS-X systems has been also repported.
dnl #
dnl #@noindent
dnl # The GNU C++ compiler is a free software
dnl # available at @url{http://www.gnu.org}.
dnl # The CLANG C++ compiler is also a free software
dnl # available at @url{http://clang.llvm.org}.
dnl # The Intel C++ compiler is a privative software.
dnl #
dnl #@noindent
dnl # So, the Rheolef library is expected to compile without problems
dnl # with one of these compilers. Otherwise, please send a bug report
dnl # to @url{mailto:rheolef@@grenet.fr}.
dnl #
dnl #@toindex kai c++ compiler
dnl #@toindex cray c++ compiler
dnl #@toindex mac osx, operating system
dnl #@toindex cray unicos, operating system
dnl #@toindex hpux, operating system
dnl #@toindex irix, operating system
dnl #@toindex irix, operating system
dnl #@noindent
dnl # Older Rheolef 5.x versions was tested also on the
dnl # KAI  C++ compiler (KCC-3.2b) and the
dnl # CRAY C++ compiler (CC-3.0.2.0)
dnl # on the following operating systems:
dnl #
dnl #@example
dnl #  mac os x (i386-apple-darwin9.8.0), using GNU C++
dnl #  sun solaris 2.8, ultrasparc, using GNU C++
dnl #  compacq OSF1 alpha (V5.1, V4.0), using Compacq C++
dnl #  aix 4.1 ibm sp2, multiprocessor based on rs6000
dnl #  cray unicos t3e, multiprocessor based on 64 bits dec alpha
dnl #  cray unicos c94
dnl #  hpux 9.05 and 10.20, hppa
dnl #  sgi irix 6.3, mips
dnl #  sun solaris 2.5.1, sparc
dnl #@end example
dnl #
dnl #@noindent
dnl # The KAI C++ is available at @url{http://www.kai.com}.
dnl # The CRAY C++ is available on CRAY platforms.
dnl # Nevertheless, the current version has no more been tested
dnl # on these compilers and systems.
dnl #
dnl #CONFIGURE COMMAND LINE OPTIONS:
dnl #@noindent
dnl # If the required libraries are located in a non-standard directory, please use
dnl # the configure options:
dnl #
dnl #@example
dnl #  ./configure --help
dnl #@end example
dnl #
dnl #@noindent
dnl # and also consider the CXX, CXXFLAGS and LIBS variables, as in the following more complex
dnl # configure command:
dnl #
dnl #@example
dnl #  CXX=clang++ CXXFLAGS=-I/misc/include LIBS="-L/misc/lib" ./configure
dnl #@end example
dnl #
dnl #@noindent
dnl # Finaly, if troubles still persist after the configure step, you can also edit 
dnl # directly the config/config.mk and config/config.h files. In these cases please also post
dnl # to the mailling list @url{mailto:rheolef@@grenet.fr} for any portability problem.
dnl #
dnl #@toindex Makefile
dnl #@noindent
dnl # If you are running a another compiler and operating system combination,
dnl # please run the non-regression test suite:
dnl #
dnl #@example
dnl #@cartouche
dnl #  make check
dnl #@end cartouche
dnl #@end example
dnl #
dnl #@noindent
dnl # Please, send mails and bug reports to the mailing list @url{mailto:rheolef@@grenet.fr}.
dnl #
dnl #CONFIGURE COMMAND LINE OPTIONS:
dnl #@noindent
dnl #@table @code
dnl-------------------------------------------------------------------------
dnl   avoid config.cache creation (hpux9*: "sh internal 2K buffer overflow")
dnl-------------------------------------------------------------------------

define([AC_CACHE_LOAD], )dnl
define([AC_CACHE_SAVE], )dnl

dnl libtool creates a "conftest" subdir
dnl that persists when entering ^C :

chmod -R a+rwx conftest
/bin/rm -rf conftest

dnl-------------------------------------------------------------------------
dnl   init autoconf
dnl-------------------------------------------------------------------------

AC_INIT([rheolef], 7.0)

dnl echo "configure: testing ${srcdir}/config/config.h"
if test -f ${srcdir}/config/config.h; then
  if test -f ${srcdir}/config/config.h.cache && diff ${srcdir}/config/config.h ${srcdir}/config/config.h.cache >/dev/null ; then
    dnl echo "configure: conserving ${srcdir}/config/config.h in cache"
    rm -f ${srcdir}/config/config.h
  else
    dnl echo "configure: putting ${srcdir}/config/config.h in cache"
    mv ${srcdir}/config/config.h ${srcdir}/config/config.h.cache
  fi
dnl else
dnl   echo "configure: no ${srcdir}/config/config.h"
fi

AC_PREREQ(2.57)
AC_CONFIG_AUX_DIR([config])
AC_CONFIG_MACRO_DIR([config])

dnl-------------------------------------------------------------------------
dnl   defines PACKAGE and VERSION
dnl-------------------------------------------------------------------------

PACKAGE="${PACKAGE_NAME}"
VERSION=`cat ${srcdir}/VERSION | sed -e 's/\([[0-9]]*\.[[0-9]]*\)-[[0-9]]*/\1/'`
if test x"${PACKAGE_VERSION}" != x"${VERSION}"; then
  echo "AC INIT: may be initialized with ${PACKAGE} version ${VERSION} instead of ${PACKAGE_VERSION}"
  exit 1
fi
echo "configuring $PACKAGE $VERSION..."
MINOR_VERSION=`echo $VERSION | awk -F. '{print $NF}'`
MAJOR_VERSION=`echo $VERSION | awk -F. '{i=NF-1; print $i}'`
MICRO_VERSION=`cat ${srcdir}/VERSION | sed -e 's/.*-//'`

# if test $MINOR_VERSION -ge 100; then
#    MINOR_VERSION=0
#    echo "** WARNING: VERSION $VERSION"
#    echo "** WARNING: MINOR_VERSION = $MINOR_VERSION should be < 100 (for library version setting)"
#    MAJOR_VERSION=`expr $MAJOR_VERSION + 1`
#    MINOR_VERSION=0
#    VERSION="$MAJOR_VERSION.$MINOR_VERSION"
#    echo "** WARNING: setting VERSION to $VERSION"
#    echo $VERSION > $srcdir/VERSION
#    echo 
# fi

# by default; try to activate distributed features
rheo_use_distributed=yes

dnl-------------------------------------------------------------------------
dnl   checking for autotools
dnl-------------------------------------------------------------------------
dnl automake 1.5 will suppose these checks done

AC_CHECK_PROGS(ACLOCAL, aclocal)
AC_CHECK_PROGS(AUTOHEADER, autoheader)
AC_CHECK_PROGS(AUTOCONF, autoconf)
AC_CHECK_PROGS(AUTOMAKE, automake)
AC_CHECK_PROGS(AMTAR, tar gtar)
AC_CHECK_PROGS(MAKEINFO, makeinfo)

dnl-------------------------------------------------------------------------
dnl   init automake
dnl-------------------------------------------------------------------------

AC_CONFIG_SRCDIR([config/install-sh])
AM_INIT_AUTOMAKE

AM_CONFIG_HEADER([config/acconfig.h])

ACLOCAL_AMFLAGS="-I ${srcdir}/config"
AC_SUBST(ACLOCAL_AMFLAGS)
dnl see also in top Makefile.am: AUTOMAKE_OPTIONS = 1.5 dist-bzip2

dnl AC_SUBST(CONFIGURE_DEPENDENCIES)
dnl CONFIGURE_DEPENDENCIES=""\$(top_srcdir)/config/acinclude.m4"

dnl-------------------------------------------------------------------------
dnl   set PREFIX directory for installation
dnl-------------------------------------------------------------------------

default_prefix=/usr/local
AC_PREFIX_DEFAULT(${default_prefix})
test x"${prefix}" = x"NONE" && prefix=${default_prefix}

pkgdatadir=${prefix}/share/rheolef
AH_TEMPLATE([PKGDATADIR], Defines the package data directory)
AC_DEFINE_UNQUOTED(PKGDATADIR,"$pkgdatadir")

dnl libdir="${exec_prefix}/lib" by default,
dnl thus, we may eval the string:
test x"${exec_prefix}" = x"NONE" && exec_prefix=${prefix}
command="echo \"$libdir\""
rheolef_libdir=`eval $command`
AH_TEMPLATE([RHEOLEF_LIBDIR], Defines the object code libraries directory)
AC_DEFINE_UNQUOTED(RHEOLEF_LIBDIR,"${rheolef_libdir}")

dnl-------------------------------------------------------------------------
dnl   init C++
dnl-------------------------------------------------------------------------

AC_CANONICAL_HOST

USER_CFLAGS=${CFLAGS-"-O3"}
USER_CXXFLAGS="$CXXFLAGS"

AC_PROG_CC(gcc cc icc cl)
AC_PROG_CPP
AC_PROG_CXX(g++ c++ icpc KCC CC cc++ xlC aCC)
AC_PROG_CXXCPP

# when GNU C/C++ is recognized, force "-O2 -g" => skip it
CFLAGS="${USER_CFLAGS}"
CXXFLAGS="${USER_CXXFLAGS}"

dnl AC_LANG_CPLUSPLUS
AC_LANG(C++)

dnl-------------------------------------------------------------------------
dnl libtool
dnl-------------------------------------------------------------------------
AC_DISABLE_FAST_INSTALL
AC_ENABLE_SHARED
AM_DISABLE_STATIC
AM_PROG_LIBTOOL

dnl since library interface (headers) are modified at each release
dnl libraries are numbered libxxx.so.421.0.0 if VERSION=4.21
LIBRARY_VERSION=${VERSION}
AC_SUBST(LIBRARY_VERSION)
LIBTOOL_VERSION_INFO="-version-info ${MAJOR_VERSION}:${MINOR_VERSION}:0"
LIBTOOL_RELEASE="-release ${MAJOR_VERSION}.${MINOR_VERSION}"

dnl libtool init has computed the name of the environment variable SHLIBPATH
dnl thus, propagate it:
AC_SUBST(LIBTOOL_VERSION_INFO)
AC_SUBST(LIBTOOL_RELEASE)

dnl-------------------------------------------------------------------------
dnl #@toindex float: quadruple or extended floating arithmetic library
dnl #
dnl #    @item --with-float=@var{option}
dnl #        Turns on/off the extended arithmetic feature.
dnl #        The @var{option} could be either @code{float128} (quadruple precision, 32 digits),
dnl #        or the default @code{double} (double precision, 16 digits).
dnl-------------------------------------------------------------------------
rheo_float_ext=""
rheo_have_float128="no"
AC_ARG_WITH(float,
    [  --with-float[[=ARG]]            the extended floating arithmetic (default ARG=double, otherwise float128) ],
    [  case "${withval}" in
          yes|no) rheo_float_ext="";;
          *)      rheo_float_ext=${withval};;
       esac],
    [  rheo_float_ext="" ]
)
if test x"$rheo_float_ext" = x"float128"; then
  rheo_have_float128=yes
elif test x"$rheo_float_ext" = x"double"; then
  rheo_have_float128=no
  rheo_float_ext=""
elif test x"$rheo_float_ext" != x""; then
  echo "ERROR: unsupported float: $rheo_float_ext" ; exit 1
  rheo_float_ext=""
fi
dnl-------------------------------------------------------------------------
dnl #
dnl #    @item --enable-permissive
dnl #        The compiler do not turns all warnings into errors and becomes permissive.
dnl #        This feature is for code developers and is off by default.
dnl-------------------------------------------------------------------------
AC_ARG_ENABLE(permissive,
    AC_HELP_STRING(--enable-permissive,
        [the compiler turns to be permissive.  [[default=no]]]),
    [  case "${enableval}" in
          yes | no) rheo_permissive=${enableval};;
          *)        rheo_permissive=no;;
       esac],
    [ rheo_permissive=no ]
)
permissive_opts=""
if test x"${rheo_permissive}" = x"yes"; then
  permissive_opts="-fpermissive"
else
  permissive_opts="-Werror"
fi
dnl-------------------------------------------------------------------------
dnl is it a well-known C++ compiler ?
dnl-------------------------------------------------------------------------
RHEO_RECOGNIZE_CXX
if test x"${rheo_cxx}" = x"gnu"; then
    RHEO_GXX2011
    if test x"${rheo_gxx2011}" = x"yes"; then
      if test x"${rheo_have_float128}" = x"yes"; then
        CXXFLAGS="${CXXFLAGS} -std=gnu++11"
      else
        CXXFLAGS="${CXXFLAGS} -std=c++11"
      fi
    else
      RHEO_GXX2011_PRE
      if test x"${rheo_gxx2011_pre}" = x"yes"; then
        if test x"${rheo_have_float128}" = x"yes"; then
          CXXFLAGS="${CXXFLAGS} -std=gnu++0x"
        else
          CXXFLAGS="${CXXFLAGS} -std=c++0x"
        fi
      else
        CXXFLAGS="${CXXFLAGS} -ansi"
      fi
    fi
    CXXFLAGS="${CXXFLAGS} -Wall ${permissive_opts} -Wno-unused -Wno-strict-aliasing -Wno-literal-suffix -Wno-deprecated-declarations"
    LDFLAGS="${LDFLAGS} -Wl,--as-needed"
elif test x"${rheo_cxx}" = x"clang"; then
    CXXFLAGS="${CXXFLAGS} -Wall ${permissive_opts} -Wno-unused -Wno-strict-aliasing -Wno-deprecated-declarations -Wno-deprecated-register -std=c++11"
    LDFLAGS="${LDFLAGS} -Wl,--as-needed"
fi
#echo "CXXFLAGS ${CXXFLAGS}"
dnl-------------------------------------------------------------------------
dnl   for backward compatibility tests (with old rheolef versions)
dnl-------------------------------------------------------------------------
AH_TEMPLATE([MAJOR_VERSION], Defines the package major version)
AC_DEFINE_UNQUOTED(MAJOR_VERSION,${MAJOR_VERSION})

AH_TEMPLATE([MINOR_VERSION], Defines the package minor version)
AC_DEFINE_UNQUOTED(MINOR_VERSION,${MINOR_VERSION})

dnl-------------------------------------------------------------------------
dnl   check some commands
dnl-------------------------------------------------------------------------
dnl x86 specific flags
RHEO_CXX_FLAGS_IEEE

dnl for compile time:
AC_PROG_CPP
RHEO_PROG_GNU_MAKE

dnl for documentation time:
AC_CHECK_PROGS(COL, col)
dnl col -b -x seems to be buggy on squeeze, wheezy and most ubuntu...
dnl uncomment when col becomes more robust:
COL=""
AM_CONDITIONAL(COMPILE_COL, test x"${COL}" = x"")
test x"${COL}" != x"" || COL="\${top_builddir}/config/col"
AC_CHECK_PROGS(TEX, tex)
AC_CHECK_PROGS(LATEX, latex)
AC_CHECK_PROGS(PDFLATEX, pdflatex)
if test x"$LATEX" != x""; then
    RHEO_CHECK_LATEX_HYPEREF
fi
AC_CHECK_PROGS(BIBTEX, bibtex)
AC_CHECK_PROGS(MAKEINDEX, makeindex)
AC_CHECK_PROGS(FIG2DEV, fig2dev)
AC_CHECK_PROGS(GNUPLOT, gnuplot, gnuplot)
AC_CHECK_PROGS(TEXI2DVI, texi2dvi)
AC_CHECK_PROGS(TEXI2PDF, texi2pdf)
AC_CHECK_PROGS(DVIPS, dvips)
AC_CHECK_PROGS(PS2PDF, ps2pdf)
AC_CHECK_PROGS(DOXYGEN, doxygen)
AC_CHECK_PROGS(DOT, dot)
if test x"$DOT" != x""; then
    HAVE_DOT=YES
    AC_SUBST(HAVE_DOT)
fi
AC_CHECK_PROGS(CONVERT, convert)

dnl graphics: is plotmtv the default output ?
AH_TEMPLATE([HAVE_PLOTMTV], Defines whether plotmtv graphics is available)
AC_CHECK_PROGS(PLOTMTV, plotmtv, plotmtv)
if test x"$PLOTMTV" != x""; then
    AC_DEFINE(HAVE_PLOTMTV)
fi

dnl for check time:
AC_CHECK_PROGS(GZIP_BIN, gzip)
AC_CHECK_PROGS(BZIP2_BIN, bzip2)
dnl AC_CHECK_PROGS(OCTAVE, octave)

dnl for maintainers:
RHEO_CHECK_FLEX
AC_CHECK_PROGS(BISON, bison)
AC_CHECK_PROGS(M4, m4)
AC_CHECK_PROGS(GPERF, gperf)

dnl-------------------------------------------------------------------------
dnl   check some C++ library headers 
dnl-------------------------------------------------------------------------

dnl ------------------
dnl c standard headers
dnl ------------------
AC_CHECK_HEADERS(climits, break)
AC_CHECK_HEADERS(cmath, break)
AC_CHECK_HEADERS(cstdio, break)
AC_CHECK_HEADERS(cstdlib, break)
AC_CHECK_HEADERS(cctype, break)
AC_CHECK_HEADERS(cassert, break)
AC_CHECK_HEADERS(cfloat, break)
AC_CHECK_HEADERS(cstring, break)
AC_CHECK_HEADERS(cstdarg, break)
AC_CHECK_HEADERS(ctime, break)

dnl --------------------
dnl c++ standard headers
dnl --------------------
AC_CHECK_HEADERS(limits, break, [AC_MSG_ERROR(rheolef requires numeric_limits)])
AC_CHECK_HEADERS(iostream iostream.h, break)
AC_CHECK_HEADERS(iomanip iomanip.h, break)
AC_CHECK_HEADERS(ios ios.h, break)
AC_CHECK_HEADERS(string bstring.h mstring.h, break)
AC_CHECK_HEADERS(sstream sstream.h strstream strstream.h, break)
AC_CHECK_HEADERS(iterator iterator.h, break)
AC_CHECK_HEADERS(functional function.h functional.h, break)
AC_CHECK_HEADERS(numeric numeric.h, break)
AC_CHECK_HEADERS(algorithm algo.h algobase.h, break)
AC_CHECK_HEADERS(memory memory.h defalloc.h, break)
AC_CHECK_HEADERS(istream istream.h, break)
AC_CHECK_HEADERS(ostream ostream.h, break)
AC_CHECK_HEADERS(fstream fstream.h, break)

AC_CHECK_HEADERS(vector vector.h, break)
AC_CHECK_HEADERS(list list.h, break)
AC_CHECK_HEADERS(set set.h, break)
AC_CHECK_HEADERS(map map.h, break)

dnl on solaris/g++ we have <utility> for C++ and <utility.h> for C
dnl on solaris2.7: /usr/include/utility.h is a C header
dnl that includes <curses.h>, and curses.h #define erase(..)
dnl and erase() is an inline fct in C++ <vector.h> : aie..!
AC_CHECK_HEADERS(utility utility.h, break)

dnl ------------------------
dnl c++ non-standard headers
dnl ------------------------
dnl skip: avoid "obsolete" warning
dnl AC_CHECK_HEADERS(slist slist.h, break)
dnl AC_CHECK_HEADERS(hash_map hash_map.h, break)

dnl-------------------------------------------------------------------------
dnl   check some C system library headers
dnl-------------------------------------------------------------------------

AC_CHECK_HEADERS(symlink.h, break)
AC_CHECK_HEADERS(unistd.h, break)

dnl-------------------------------------------------------------------------
dnl   check C++ compiler features...
dnl-------------------------------------------------------------------------

RHEO_CHECK_ISTREAM_RDBUF
if test x"${rheo_have_istream_rdbuf}" != x"yes"; then
  RHEO_CHECK_IOS_BP
fi
RHEO_CHECK_IOS_SETSTATE
RHEO_CHECK_IOS_BITALLOC

dnl obsolete:
dnl RHEO_CHECK_TEMPLATE_FULL_SPECIALIZATION
dnl RHEO_CHECK_NAMESPACE

dnl C++ 2011 standard:
RHEO_CHECK_STD_INITIALIZER_LIST
AM_CONDITIONAL(HAVE_STD_INITIALIZER_LIST, test x"${rheo_have_std_initializer_list}" = x"yes")
RHEO_CHECK_VARIADIC_TEMPLATE

dnl-------------------------------------------------------------------------
dnl   check C++ system library
dnl-------------------------------------------------------------------------

AC_FUNC_ALLOCA
if test x"$ALLOCA" != x""; then
    ALLOCA="\${top_builddir}/config/$ALLOCA"
fi     

AC_CHECK_FUNCS([gettimeofday])
RHEO_CXX_CLOCK_GETTIME
if test "$rheo_have_cxx_clock_gettime" = "yes"; then
  AC_SEARCH_LIBS([clock_gettime], [rt],
    [AC_DEFINE([HAVE_CLOCK_GETTIME], [1],
    [Define to 1 if your system has the clock_gettime function.])])
else
  RHEO_CHECK_GETTIMEOFDAY
  if test x"${rheo_have_gettimeofday}" != x"yes"; then
    RHEO_CHECK_WIERDGETTIMEOFDAY
    if test x"${rheo_have_wierdgettimeofday}" != x"yes"; then
      RHEO_CHECK_BSDGETTIMEOFDAY
    fi
  fi
fi
dnl-------------------------------------------------------------------------
dnl   check C++ math library
dnl-------------------------------------------------------------------------

RHEO_CHECK_ISINF_DOUBLE
RHEO_CHECK_FINITE_DOUBLE
RHEO_CHECK_ABS_DOUBLE
RHEO_CHECK_SQR_DOUBLE

dnl-------------------------------------------------------------------------
dnl # 
dnl #@toindex cln, arbitrary precision float library
dnl # 
dnl #    @item --with-bigfloat=@var{digits10}
dnl #        Turn on Bruno Haible's @code{cln} arbitrary
dnl #        precision float library with @var{digits10} precision,
dnl #
dnl #        See @url{http://clisp.cons.org/~haible/packages-cln.html}.
dnl #        Default is off.
dnl #        The @var{digits10} value is optional and
dnl #        default @var{digits10} value is 60.
dnl # 	     This feature is still under development.
dnl # 
dnl #    @item --with-cln=@var{dir_cln}
dnl #        Set the home directory for the @code{cln} library.
dnl #        Default @var{dir_cln} is @file{/usr/local/math}.
dnl-------------------------------------------------------------------------
AH_TEMPLATE([DIGITS10], Define the arbitrary precision)
rheo_digits10=60
rheo_default_bigfloat="no"
AC_ARG_WITH(bigfloat,
    [  --with-bigfloat[[=DIGITS10]]    use bigfloat builtin CLN-based class with DIGITS10 (default=no, DIGITS10=60) ],
    [changequote(%%, %%)dnl
     case "${withval}" in
          yes) with_bigfloat="yes"
               ;;
          no)  with_bigfloat="no"
               ;;
          [0-9]*)  with_bigfloat="yes"
               rheo_digits10="${withval}"
               ;;
          *)   echo "    ERROR: bad value ${withval} for --with-bigfloat"; exit 1
               ;;
     esac
     changequote([, ])dnl
    ],
    [with_bigfloat=${rheo_default_bigfloat}]
)

rheo_dir_cln="/usr"
AC_ARG_WITH(cln,
    [  --with-cln[[=DIR]]              CLN library prefix directory (default=no) ],
    [case "${withval}" in
          yes) with_cln="yes"
               ;;
          no)  with_cln="no"
               ;;
          /*)  with_cln="yes"
               rheo_dir_cln="${withval}"
               ;;
          *)   echo "    ERROR: bad value ${withval} for --with-cln"; exit 1
               ;;
     esac],
    [with_cln=${rheo_default_bigfloat}]
)
# echo with_bigfloat ${with_bigfloat}
# echo with_cln ${with_cln}
if test x"${with_bigfloat}" = x"yes" -o x"${with_cln}" = x"yes"; then
    with_cln="yes"
    RHEO_CHECK_CLN
    # set: rheo_have_cln=..
else
    rheo_have_cln="no"
fi
AM_CONDITIONAL(HAVE_CLN, test x"${with_cln}" = x"yes")
if test x"${rheo_have_cln}" = x"yes"; then
    LDADD_BIGFLOAT="\${top_builddir}/util/bigfloat/libbigfloat.la ${LDADD_CLN}"
    INCLUDES_BIGFLOAT="${INCLUDES_CLN}"
    AC_DEFINE_UNQUOTED(DIGITS10,${rheo_digits10})
fi
# echo rheo_have_cln ${rheo_have_cln}
dnl-------------------------------------------------------------------------
dnl float, continued
dnl-------------------------------------------------------------------------
if test x"$rheo_have_float128" = x"yes"; then
  RHEO_CHECK_FLOAT128
fi
AM_CONDITIONAL(HAVE_FLOAT128, test x"${rheo_have_float128}" = x"yes")
dnl-------------------------------------------------------------------------
dnl set externded arithmetic flag (avoid mpi and cgal, not yet supoported)
dnl-------------------------------------------------------------------------
if test x"${rheo_have_cln}" = x"yes" -o x"${rheo_float_ext}" != x""; then
  with_extended_arithmetic="yes"
else
  with_extended_arithmetic="no"
fi
#echo "rheo_float_ext=$rheo_float_ext"
#echo "with_extended_arithmetic=$with_extended_arithmetic"
dnl-------------------------------------------------------------------------
dnl Check for Ginac : computer algebra system in C++
dnl used to generate FEM basis and elementary forms
dnl-------------------------------------------------------------------------
AC_ARG_ENABLE(ginac,
    [  --enable-ginac          GiNaC (for rheolef developers; default=yes) ],
    [  case "${enableval}" in
          yes | no) enable_ginac=${enableval};;
          *)        enable_ginac=yes;;
       esac],
    [ enable_ginac=yes ]
)
if test x"$with_extended_arithmetic" = x"yes"; then
    enable_ginac=no
fi
#echo "enable_ginac=$enable_ginac"
if test x"$enable_ginac" = x"yes"; then
  RHEO_CHECK_GINAC
fi
AM_CONDITIONAL(HAVE_GINAC, test x"${rheo_have_ginac}" = x"yes")
#echo "rheo_have_ginac=$rheo_have_ginac"
dnl-------------------------------------------------------------------------
dnl Check for GMP interface : big float and integers in C++
dnl used by 3D octree (fast point localization in mesh)
dnl-------------------------------------------------------------------------
dnl AC_SUBST(LDADD_GMPXX)
dnl AC_CHECK_HEADERS(gmpxx.h, [LDADD_GMPXX="-lgmpxx"])
dnl-------------------------------------------------------------------------
dnl check for: unsigned long long int (used by geo_tree.h)
dnl-------------------------------------------------------------------------
AC_TYPE_LONG_LONG_INT
AC_TYPE_UNSIGNED_LONG_LONG_INT
dnl-------------------------------------------------------------------------
dnl # 
dnl #@toindex debian
dnl # 
dnl #    @item --enable-debian-packaging=@var{debian_packaging} 
dnl #        Generate files the debian way 
dnl #        by respecting the `Debian Policy Manual`.
dnl 
dnl TODO: suppress this option (to be managed by debian/rules)
dnl-------------------------------------------------------------------------
pkglibdir="$libdir/$PACKAGE"
AC_SUBST(pkglibdir)
AC_ARG_ENABLE(debian-packaging,
    [  --enable-debian-packaging  Only if you are creating deb packages (default=no) ],
    [  case "${enableval}" in
          yes)  debian_packaging="yes"
	        doc_dir="rheolef-doc"
	       	   ;;
          *)    debian_packaging=""
	        doc_dir="rheolef"
               	   ;;
       esac],
    [  debian_packaging="" 
       doc_dir="rheolef"
    ]
)
AC_SUBST(doc_dir)
AM_CONDITIONAL(HAVE_DEBIAN_PACKAGING, test x"${debian_packaging}" = x"yes")
dnl-------------------------------------------------------------------------
dnl # 
dnl #@toindex boost, generic dense/sparse matrix library
dnl # 
dnl #    @item  --with-boost-incdir=@var{incdir_boost} 
dnl #    @itemx --with-boost-libdir=@var{libdir_boost} 
dnl #        Specifies the @code{boost} library.
dnl #        This library is required by rheolef.
dnl-------------------------------------------------------------------------
AC_ARG_WITH(boost-incdir,
    [  --with-boost-incdir[[=DIR]]     the boost includes directory (required; default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_incdir_boost=""
	       	   ;;
          *)       rheo_incdir_boost=${withval}
               	   ;;
       esac],
    [  rheo_incdir_boost="" ]
)
AC_ARG_WITH(boost-libdir,
    [  --with-boost-libdir[[=DIR]]     the boost libraries directory (required; default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_libdir_boost=""
	       	   ;;
          *)       rheo_libdir_boost=${withval}
               	   ;;
       esac],
    [  rheo_libdir_boost="" ]
)
RHEO_CHECK_BOOST
RHEO_CHECK_BOOST_UBLAS

AM_CONDITIONAL(HAVE_BOOST, test x"${rheo_have_boost}" = x"yes")
if test x"${rheo_have_boost}" = x"yes"; then
  true
else
  AC_MSG_ERROR(required boost/ublas library not found)
fi
dnl-------------------------------------------------------------------------
dnl # 
dnl #@toindex armaidillo, generic dense/sparse matrix library
dnl # 
dnl #    @item  --with-armadillo-incdir=@var{incdir_armadillo} 
dnl #    @itemx --with-armadillo-libdir=@var{libdir_armadillo} 
dnl #        Specifies the @code{armadillo} library.
dnl #        This library is required by rheolef.
dnl-------------------------------------------------------------------------
AC_ARG_WITH(armadillo-incdir,
    [  --with-armadillo-incdir[[=DIR]] the armadillo includes directory (required; default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_incdir_armadillo=""
	       	   ;;
          *)       rheo_incdir_armadillo=${withval}
               	   ;;
       esac],
    [  rheo_incdir_armadillo="" ]
)
AC_ARG_WITH(armadillo-libdir,
    [  --with-armadillo-libdir[[=DIR]] the armadillo libraries directory (required; default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_libdir_armadillo=""
	       	   ;;
          *)       rheo_libdir_armadillo=${withval}
               	   ;;
       esac],
    [  rheo_libdir_armadillo="" ]
)
RHEO_CHECK_ARMADILLO

AM_CONDITIONAL(HAVE_ARMADILLO, test x"${rheo_have_armadillo}" = x"yes")
if test x"${rheo_have_armadillo}" = x"yes"; then
  true
else
  AC_MSG_ERROR(required armadillo library not found)
fi
dnl-------------------------------------------------------------------------
dnl #
dnl #@pindex dmalloc
dnl #@toindex dmalloc, debug runtime library
dnl #@cindex  debugging
dnl #
dnl #    @item --enable-debug
dnl #        Produce a @code{c++ -g} like code.
dnl #    @item --enable-dmalloc
dnl #	     With debugging, also uses dynamic allocation runtime checking
dnl #	     with @code{dmalloc} when available.
dnl-------------------------------------------------------------------------
AH_TEMPLATE([PARANO], Defines it if you are parano for debug)
AC_SUBST(INSTALL_PROGRAM_FLAGS)
AC_ARG_ENABLE(debug,
    [  --enable-debug          debug mode (default=no) ],
    [  case "${enableval}" in
          yes | no) enable_debug=${enableval};;
          *)        enable_debug=yes;;
       esac],
    [ enable_debug=no ]
)
AC_ARG_ENABLE(dmalloc,
    [  --enable-dmalloc        dmalloc debug library, when available; requiers debug mode (default=no) ],
    [  case "${enableval}" in
          yes | no) enable_dmalloc=${enableval};;
          *)        enable_dmalloc=yes;;
       esac],
    [ enable_dmalloc=no ]
)
if test x"${enable_debug}" = x"yes"; then
    CXXFLAGS="$CXXFLAGS -g"
    LDFLAGS="$LDFLAGS -g"
    AC_DEFINE(PARANO)
    INSTALL_PROGRAM_FLAGS=""
    if test x"${enable_dmalloc}" = x"yes"; then
        RHEO_CHECK_DMALLOC
    fi
else
    INSTALL_PROGRAM_FLAGS="-s"
fi
AM_CONDITIONAL(HAVE_DMALLOC, test x"${rheo_have_dmalloc}" = x"yes")

dnl-------------------------------------------------------------------------
dnl #
dnl #    @item --enable-old-code
dnl #        Turns on/off the old code branch (before distributed computation features).
dnl #        Default is off.
dnl-------------------------------------------------------------------------
rheo_enable_old_code=no
AC_ARG_ENABLE(old-code,
    [  --enable-old-code       for going back to old code branch (5.93 branch; default=no) ],
    [  case "${enableval}" in
          yes | no) rheo_enable_old_code=${enableval} ;;
          *)        rheo_enable_old_code=no ;;
       esac
    ],
    [
      rheo_enable_old_code=no
    ]
)
if test x"${rheo_enable_old_code}" = x"yes"; then
  rheo_enable_new_code=no
else
  rheo_enable_new_code=yes
fi
dnl-------------------------------------------------------------------------
dnl #
dnl #    @item --enable-mpi
dnl #        Turns on/off the distributed computation features.
dnl #        Default is on when distributed is on. This feature is currently in development.
dnl #        When on, configure try to detect either the scotch or the parmetis libraries.
dnl-------------------------------------------------------------------------
rheo_incdir_mpi=""
rheo_libdir_mpi=""
#rheo_libs_openmpi="-lmpi_cxx -lmpi_f77 -lmpi -lopen-rte -lopen-pal"
rheo_libs_openmpi="-lmpi_cxx -lmpi"
AC_ARG_ENABLE(mpi,
    [  --enable-mpi            MPI library, for distributed algebra (default=yes) ],
    [  case "${enableval}" in
          yes | no) enable_mpi="${enableval}";;
          *)        enable_mpi="yes";;
       esac],
    [ enable_mpi="${rheo_enable_new_code}" ]
)
AC_ARG_WITH(mpi-incdir,
    [  --with-mpi-incdir[[=DIR]]       the mpi includes directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_incdir_mpi="";;
          *)       rheo_incdir_mpi=${withval};;
       esac]
)
AC_ARG_WITH(mpi-libdir,
    [  --with-mpi-libdir[[=DIR]]       the mpi library directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_libdir_mpi="";;
          *)       rheo_libdir_mpi=${withval};;
       esac]
)
AC_ARG_WITH(mpi-libs,
    [  --with-mpi-libs[[=LIBS]]        the mpi library linker flags (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_libs_mpi="";;
          *)       rheo_libs_mpi=${withval};;
       esac]
)
if test x"$enable_mpi" = x"yes"; then
    RHEO_CHECK_MPI
fi
if test x"$rheo_have_mpi" = x"yes"; then
    # if mpi is set, then default is distributed version
    rheo_enable_new_code="yes"
else
    rheo_use_distributed=no
fi
AM_CONDITIONAL(USE_NEW_CODE, test x"${rheo_enable_new_code}" = x"yes")
AH_TEMPLATE([USE_NEW_CODE], Defines whether use the new code branch)
AC_SUBST(USE_NEW_CODE)
if test x"$rheo_enable_new_code" = x"yes"; then
    AC_DEFINE(USE_NEW_CODE)
    USE_NEW_CODE=true
else
    USE_NEW_CODE=false
fi
dnl-------------------------------------------------------------------------
dnl #@toindex scotch, distributed mesh partitioner
dnl #
dnl #    @item  --with-scotch-incdir=@var{incdir_scotch} 
dnl #    @itemx --with-scotch-libdir=@var{libdir_scotch} 
dnl #    @itemx --with-scotch-libs=@var{libs_scotch} 
dnl #        Turns on/off the @code{scotch} distributed mesh partitioner.
dnl #        Check in @var{libdir_scotch} for @code{libptscotchparmetis.so}, 
dnl #        @code{libptscotch.so} and @code{libptscotcherrexit.so} or
dnl #        corresponding @code{.a} libraries.
dnl #        Default is to auto-detect when mpi is available.
dnl-------------------------------------------------------------------------
dnl #@toindex parmetis, distributed mesh partitioner
dnl #
dnl #    @item  --with-parmetis-incdir=@var{incdir_parmetis} 
dnl #    @itemx --with-parmetis-libdir=@var{libdir_parmetis} 
dnl #        Turns on/off the @code{parmetis} distributed mesh partitioner.
dnl #        Check in @var{libdir_parmetis} for @code{libparmetis.so},
dnl #        @code{libparmetis.a} and also @code{libmetis.a}
dnl #        @code{libmetis.so}.
dnl #        Default is to autodetect when mpi is available and scotch unavailable.
dnl-------------------------------------------------------------------------
with_scotch=""
rheo_incdir_scotch=""
rheo_libdir_scotch=""
rheo_libs_scotch="-lptscotchparmetis -lptscotch -lptscotcherrexit -lz"
#rheo_libs_scotch="-lptscotchparmetis -lptscotch -lptscotcherrexit -lscotch -lscotcherrexit"
AC_ARG_WITH(scotch-incdir,
    [  --with-scotch-incdir[[=DIR]]    the scotch distributed mesh partitioner includes directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  with_scotch=${withval};;
          *)       rheo_incdir_scotch=${withval}
		   with_scotch=yes
               	   ;;
       esac]
)
AC_ARG_WITH(scotch-libdir,
    [  --with-scotch-libdir[[=DIR]]    the scotch distributed mesh partitioner library directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  with_scotch=${withval};;
          *)       rheo_libdir_scotch=${withval}
		   with_scotch=yes
               	   ;;
       esac]
)
AC_ARG_WITH(scotch-libs,
    [  --with-scotch-libs[[=LIBS]]     the scotch distributed mesh partitioner library linker flags (default=-lptscotchparmetis -lptscotch -lptscotcherrexit -lz) ],
    [  case "${withval}" in
          yes|no)  with_scotch=${withval};;
          *)       rheo_libs_scotch=${withval}
		   with_scotch=yes
               	   ;;
       esac]
)
with_metis=""
rheo_incdir_metis=""
rheo_libdir_metis=""
with_parmetis=""
rheo_incdir_parmetis=""
rheo_libdir_parmetis=""
AC_ARG_WITH(metis-incdir,
    [  --with-metis-incdir[[=DIR]]     the metis distributed mesh partitioner includes directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  with_metis=${withval};;
          *)       rheo_incdir_metis=${withval}
		   with_metis=yes
               	   ;;
       esac]
)
AC_ARG_WITH(metis-libdir,
    [  --with-metis-libdir[[=DIR]]     the metis distributed mesh partitioner library directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  with_metis=${withval};;
          *)       rheo_libdir_metis=${withval}
		   with_metis=yes
               	   ;;
       esac]
)
AC_ARG_WITH(parmetis-incdir,
    [  --with-parmetis-incdir[[=DIR]]  the parmetis distributed mesh partitioner includes directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  with_parmetis=${withval};;
          *)       rheo_incdir_parmetis=${withval}
		   with_parmetis=yes
               	   ;;
       esac]
)
AC_ARG_WITH(parmetis-libdir,
    [  --with-parmetis-libdir[[=DIR]]  the parmetis distributed mesh partitioner library directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  with_parmetis=${withval};;
          *)       rheo_libdir_parmetis=${withval}
		   with_parmetis=yes
               	   ;;
       esac]
)
if test x"${rheo_use_distributed}" = x"yes"; then
  if test x"${with_scotch}" != x"no"; then
    RHEO_CHECK_SCOTCH
  fi
  if test x"${with_parmetis}" = x"yes"; then
    RHEO_CHECK_METIS
    if test x"${rheo_have_metis}" = x"yes"; then
      RHEO_CHECK_PARMETIS
    fi
  fi
  if test x"${rheo_have_scotch}" != x"yes" && test x"${rheo_have_parmetis}" != x"yes"; then
    rheo_use_distributed=no
  fi
fi
dnl-------------------------------------------------------------------------
dnl #@toindex blas, basic linear algebra subroutines
dnl #
dnl #    @item  --with-blas-libdidr=@var{rheo_libdir_blas}
dnl #    @itemx --with-blas-libs=@var{rheo_libs_blas} 
dnl #        Turns on/off the @code{blas} libraries.
dnl #        Check in @var{rheo_libs_blas} for @code{libblas.so}, 
dnl #        or the corresponding @code{.a} libraries.
dnl #        Default is to auto-detect.
dnl #        This librariy is required for the pastix library.
dnl-------------------------------------------------------------------------
with_blas=""
#rheo_libs_blas="-llapack -lblas"; # mumps links to libblas automatically now
rheo_libs_blas=""
AC_ARG_WITH(blas-libdir,
    [  --with-blas-libdir[[=DIR]]      the basic linear algebra subroutines (BLAS) library directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_libdir_blas=""
                   with_blas=${withval}
	       	   ;;
          *)       rheo_libdir_blas=${withval}
		   with_blas=yes
               	   ;;
       esac],
    [  rheo_libdir_blas="" ]
)
AC_ARG_WITH(blas-libs,
    [  --with-blas-libs[[=LIBS]]       the basic linear algebra subroutines (BLAS) libraries linker flags (default=-llapack -lblas) ],
    [  case "${withval}" in
          yes|no)  rheo_libs_blas=""
                   with_blas=${withval}
	       	   ;;
          *)       rheo_libs_blas=${withval}
		   with_blas=yes
               	   ;;
       esac],
    [  rheo_libs_blas="" ]
)
if test x"${rheo_enable_new_code}" = x"yes"; then
    RHEO_CHECK_BLAS
fi
dnl-------------------------------------------------------------------------
dnl #@toindex scalapack, scalable linear algebra package
dnl #
dnl #    @item  --with-scalapack-libdidr=@var{rheo_libdir_scalapack}
dnl #    @itemx --with-scalapack-libs=@var{rheo_libs_scalapack} 
dnl #        Turns on/off the @code{scalapack} libraries.
dnl #        Check in @var{rheo_libs_scalapack} for @code{libscalapack.so}, 
dnl #        or the corresponding @code{.a} libraries.
dnl #        Default is to auto-detect.
dnl #        This librariy is required for the pastix library.
dnl-------------------------------------------------------------------------
with_scalapack=""
rheo_libs_scalapack="-lscalapack-openmpi -lblacs-openmpi"
AC_ARG_WITH(scalapack-libdir,
    [  --with-scalapack-libdir[[=DIR]] the scalable linear algebra subroutines (BLAS) library directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_libdir_scalapack=""
                   with_scalapack=${withval}
	       	   ;;
          *)       rheo_libdir_scalapack=${withval}
		   with_scalapack=yes
               	   ;;
       esac],
    [  rheo_libdir_scalapack="" ]
)
AC_ARG_WITH(scalapack-libs,
    [  --with-scalapack-libs[[=LIBS]]  the scalable linear algebra subroutines (BLAS) libraries linker flags (default=-lscalapack-openmpi -lblacs-openmpi) ],
    [  case "${withval}" in
          yes|no)  rheo_libs_scalapack=""
                   with_scalapack=${withval}
	       	   ;;
          *)       rheo_libs_scalapack=${withval}
		   with_scalapack=yes
               	   ;;
       esac],
    [  rheo_libs_scalapack="" ]
)
if test x"${rheo_enable_new_code}" = x"yes"; then
    RHEO_CHECK_SCALAPACK
fi
dnl-------------------------------------------------------------------------
dnl #@toindex mumps, distributed direct solver
dnl #
dnl #    @item  --with-mumps-incdir=@var{incdir_mumps} 
dnl #    @itemx --with-mumps-libdir=@var{libdir_mumps} 
dnl #    @itemx --with-mumps-libs=@var{libs_mumps} 
dnl #        Turns on/off the @code{mumps} distributed solver.
dnl #        Check in @var{libdir_mumps} for @code{libmumps.so}, 
dnl #        or the corresponding @code{.a} libraries.
dnl #        Default is to auto-detect when mpi is available.
dnl-------------------------------------------------------------------------
if test x"${with_extended_arithmetic}" != x"yes"; then
  with_mumps="yes"
else
  with_mumps="no"
fi
rheo_incdir_mumps=""
rheo_libdir_mumps=""
rheo_libs_mumps=""
AC_ARG_WITH(mumps-incdir,
    [  --with-mumps-incdir[[=DIR]]     the mumps distributed direct solver includes directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  with_mumps=${withval};;
          *)       rheo_incdir_mumps=${withval}
		   with_mumps=yes
               	   ;;
       esac]
)
AC_ARG_WITH(mumps-libdir,
    [  --with-mumps-libdir[[=DIR]]     the mumps distributed direct solver library directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  with_mumps=${withval};;
          *)       rheo_libdir_mumps=${withval}
		   with_mumps=yes
               	   ;;
       esac]
)
AC_ARG_WITH(mumps-libs,
    [  --with-mumps-libs[[=DIR]]       the mumps distributed direct solver library linker flags (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  with_mumps=${withval};;
          *)       rheo_libs_mumps=${withval}
		   with_mumps=yes
               	   ;;
       esac]
)
if test x"${with_mumps}" = x"yes" && test x"${rheo_enable_new_code}" = x"yes"; then
  RHEO_CHECK_MUMPS
  if test x"${with_mumps}" = x"yes"; then
    RHEO_CHECK_MUMPS_WITH_SCOTCH
    RHEO_CHECK_MUMPS_WITH_PTSCOTCH
    RHEO_CHECK_MUMPS_WITH_METIS
    RHEO_CHECK_MUMPS_WITH_PARMETIS
  fi
fi
dnl-------------------------------------------------------------------------
dnl #@toindex trilinos, distributed incomplete choleski factorization
dnl #
dnl #    @item  --with-trilinos
dnl #    @itemx --with-trilinos=@var{libdir_trilinos} 
dnl #        Turns on/off the @code{trilinos} distributed preconditioner library.
dnl #        Check in @var{libdir_trilinos} for @code{libtrilinos_ifpack.so}, 
dnl #        or the corresponding @code{.a} libraries.
dnl #        Default is to auto-detect when mpi is available.
dnl-------------------------------------------------------------------------
if test x"${with_extended_arithmetic}" != x"yes"; then
  with_trilinos="yes"
else
  with_trilinos="no"
fi
rheo_incdir_trilinos=""
rheo_libdir_trilinos=""
#rheo_libs_trilinos="-ltrilinos_ifpack"
#rheo_libs_trilinos="-ltrilinos_ifpack -ltrilinos_amesos -ltrilinos_epetra -ltrilinos_teuchos -ltrilinos_galeri -ltrilinos_triutils"
rheo_libs_trilinos="-ltrilinos_ifpack -ltrilinos_amesos -ltrilinos_epetra -ltrilinos_teuchos"
AC_ARG_WITH(trilinos-incdir,
    [  --with-trilinos-incdir[[=DIR]]  the trilinos distributed preconditioner includes directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  with_trilinos=${withval};;
          *)       rheo_incdir_trilinos=${withval}
		   with_trilinos=yes
               	   ;;
       esac]
)
AC_ARG_WITH(trilinos-libdir,
    [  --with-trilinos-libdir[[=DIR]]  the trilinos distributed preconditioner library directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  with_trilinos=${withval};;
          *)       rheo_libdir_trilinos=${withval}
		   with_trilinos=yes
               	   ;;
       esac]
)
AC_ARG_WITH(trilinos-libs,
    [  --with-trilinos-libs[[=LIBS]]   the trilinos distributed preconditioner library linker flags (default=-ltrilinos_ifpack) ],
    [  case "${withval}" in
          yes|no)  with_trilinos=${withval};;
          *)       rheo_libs_trilinos=${withval}
		   with_trilinos=yes
               	   ;;
       esac]
)
if test x"${with_trilinos}" = x"yes" && test x"${rheo_use_distributed}" = x"yes" -a x"${rheo_enable_new_code}" = x"yes"; then
    # TRILIONOS requires mpi
    RHEO_CHECK_TRILINOS
fi
dnl-------------------------------------------------------------------------
dnl #@toindex pastix, distributed direct solver
dnl #
dnl #    @item  --with-pastix
dnl #    @itemx --with-pastix=@var{libdir_pastix} 
dnl #        Turns on/off the @code{pastix} distributed solver.
dnl #        Check in @var{libdir_pastix} for @code{libpastix.so}, 
dnl #        or the corresponding @code{.a} libraries.
dnl #        Default is to auto-detect when mpi is available.
dnl-------------------------------------------------------------------------
dnl pastix is now obsolete: no debian & bug on small matrix (size < np)
dnl => waiting for a debian package and bug fixes
dnl note: implementation could replace a missing trilinos or mumps
dnl
with_pastix=""
AC_ARG_WITH(pastix-incdir,
    [  --with-pastix-incdir[[=DIR]]    the pastix distributed direct solver includes directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_incdir_pastix=""
                   with_pastix=${withval}
	       	   ;;
          *)       rheo_incdir_pastix=${withval}
		   with_pastix=yes
               	   ;;
       esac],
    [  rheo_incdir_pastix="" ]
)
AC_ARG_WITH(pastix-libdir,
    [  --with-pastix-libdir[[=DIR]]    the pastix distributed direct solver library directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_libdir_pastix=""
                   with_pastix=${withval}
	       	   ;;
          *)       rheo_libdir_pastix=${withval}
		   with_pastix=yes
               	   ;;
       esac],
    [  rheo_libdir_pastix="" ]
)
if test x"${with_pastix}" != x"no" && test x"${use_distributed}" = x"yes" \
&& test x"${rheo_have_scotch}" = x"yes" && test x"${rheo_have_blas}" = x"yes" \
&& test x"${rheo_have_mumps}" != x"yes" -o x"${rheo_have_trilinos}" != x"yes"; then
    RHEO_CHECK_PASTIX
fi
dnl-------------------------------------------------------------------------
dnl # 
dnl #@toindex cholmod, sequential choleski supernodal solver library
dnl #@cindex  supernodal symetric linear solver
dnl # 
dnl #    @item  --with-cholmod-incdir=@var{incdir_cholmod} 
dnl #    @itemx --with-cholmod-libdir=@var{libdir_cholmod} 
dnl #    @itemx --with-cholmod-libs=@var{libs_cholmod} 
dnl #        Turns on/off the @code{cholmod} multifrontal direct solver.
dnl #        Default @var{incdir_cholmod} is @var{libdir_cholmod}.
dnl #        Check in @var{libdir_cholmod} for @code{libcholmod.so} or
dnl #        @code{libcholmod.a} and for header
dnl #        @var{incdir_cholmod}/cholmod.h or @var{incdir_cholmod}/cholmod/cholmod.h.
dnl-------------------------------------------------------------------------
rheo_incdir_cholmod=""
with_cholmod=no
AC_ARG_WITH(cholmod-incdir,
    [  --with-cholmod-incdir[[=DIR]]   the cholmod includes directory],
    [  case "${withval}" in
          yes|no) with_cholmod=${withval};;
          *)      rheo_incdir_cholmod=${withval}
                  with_cholmod=yes;;
       esac]
)
rheo_libdir_cholmod=""
AC_ARG_WITH(cholmod-libdir,
    [  --with-cholmod-libdir[[=DIR]]   the cholmod library directory],
    [  case "${withval}" in
          yes|no) with_cholmod=${withval};;
          *)      rheo_libdir_cholmod=${withval}
                  with_cholmod=yes;;
       esac]
)
rheo_libs_cholmod="-lcholmod -lccolamd -lcolamd -lcamd -lamd -lsuitesparseconfig"
AC_ARG_WITH(cholmod-libs,
    [  --with-cholmod-libs[[=LIBS]]    the cholmod libraries linker flags (default=-lcholmod -lccolamd -lcolamd -lcamd -lamd -lsuitesparseconfig) ],
    [  case "${withval}" in
          yes|no)  with_cholmod=${withval};;
          *)       rheo_libs_cholmod=${withval}
		   with_cholmod=yes
       esac]
)
if test x"${with_cholmod}" = x"yes" && test x"${with_bigfloat}" != x"yes"; then
    RHEO_CHECK_CHOLMOD
else
    rheo_have_cholmod="no"
fi
dnl-------------------------------------------------------------------------
dnl # 
dnl #@toindex umfpack, sequential multifrontal solver library
dnl #@cindex  multifrontal linear solver
dnl # 
dnl #    @item  --with-umfpack-incdir=@var{incdir_umfpack} 
dnl #    @itemx --with-umfpack-libdir=@var{libdir_umfpack} 
dnl #    @itemx --with-umfpack-libs=@var{libs_umfpack} 
dnl #        Turns on/off the @code{umfpack} version 4.3 multifrontal direct solver.
dnl #        Default @var{incdir_umfpack} is @var{libdir_umfpack}.
dnl #        Check in @var{libdir_umfpack} for @code{libumfpack.so} or
dnl #        @code{libumfpack.a} and for header
dnl #        @var{incdir_umfpack}/umfpack.h or @var{incdir_umfpack}/umfpack/umfpack.h.
dnl-------------------------------------------------------------------------
# when mumps in not available, try to detect umfpack
if test x"${with_extended_arithmetic}" != x"yes"; then
  with_umfpack="yes"
else
  with_umfpack="no"
fi
rheo_incdir_umfpack=""
AC_ARG_WITH(umfpack-incdir,
    [  --with-umfpack-incdir[[=DIR]]   the umfpack includes directory],
    [  case "${withval}" in
          yes|no) with_umfpack=${withval};;
          *)      rheo_incdir_umfpack=${withval}
                  with_umfpack=yes;;
       esac]
)
rheo_libdir_umfpack=""
AC_ARG_WITH(umfpack-libdir,
    [  --with-umfpack-libdir[[=DIR]]   the umfpack library directory],
    [  case "${withval}" in
          yes|no) with_umfpack=${withval};;
          *)      rheo_libdir_umfpack=${withval}
                  with_umfpack=yes;;
       esac]
)
rheo_libs_umfpack="-lumfpack -lamd"
AC_ARG_WITH(umfpack-libs,
    [  --with-umfpack-libs[[=LIBS]]    the umfpack libraries linker flags (default=-lumfpack -lamd) ],
    [  case "${withval}" in
          yes|no)  with_umfpack=${withval};;
          *)       rheo_libs_umfpack=${withval}
		   with_umfpack=yes
       esac]
)
if test x"${with_umfpack}" = x"yes" && test x"${with_bigfloat}" != x"yes"; then
    RHEO_CHECK_UMFPACK
else
    rheo_have_umfpack="no"
fi
dnl-------------------------------------------------------------------------
dnl # 
dnl #@toindex taucs, out-of-core sparse solver library
dnl #@cindex  out-of-core sparse linear solver
dnl # 
dnl #    @item  --with-taucs-ldadd=@var{taucs_ldadd} 
dnl #    @itemx --with-taucs-incdir=@var{taucs_incdir} 
dnl #        Turns on/off the @code{taucs} version 2.0 out-of-core sparse direct solver.
dnl #	     When this library is not available, the configure script
dnl #        check for the spooles multifrontal (see below).
dnl-------------------------------------------------------------------------
try_taucs=no
AC_ARG_WITH(taucs-incdir,
    [  --with-taucs-incdir[[=DIR]]     the taucs out-of-core sparse direct solver includes directory (broken) ],
    [  case "${withval}" in
          yes | no) try_taucs=${withval};;
          *)  rheo_incdir_taucs=${withval}
              try_taucs=yes;;
       esac]
)
AC_ARG_WITH(taucs-ldadd,
    [  --with-taucs-libs[[=LIBS]]      the taucs out-of-core sparse direct solver linker flags (broken) ],
    [  case "${withval}" in
          yes | no) try_taucs=${withval};;
          *)  rheo_ldadd_taucs=${withval}
              try_taucs=yes;;
       esac]
)
if test x"$rheo_enable_new_code" != x"yes"; then
  if test x"${rheo_have_mpi}" != x"yes" && test x"${try_taucs}" = x"yes" -a x"$rheo_have_umfpack" != x"yes"; then
    if test x"${rheo_have_cln}" = x"yes"; then
	echo "    ERROR: incompatible options cln/bigfloat and spooles"; exit 1
    fi
    RHEO_CHECK_TAUCS
  else
    rheo_have_taucs="no"
  fi
else
    rheo_have_taucs="no"
fi
dnl-------------------------------------------------------------------------
dnl # 
dnl #@toindex spooles, multifrontal solver library
dnl #@cindex  multifrontal linear solver
dnl # 
dnl #    @item  --with-spooles-libdir=@var{libdir_spooles} 
dnl #    @itemx --with-spooles-incdir=@var{incdir_spooles} 
dnl #        Turns on/off the @code{spooles} version 2.2 multifrontal direct solver.
dnl #        Default @var{incdir_spooles} is @var{libdir_spooles}.
dnl #        Check in @var{libdir_spooles} for @code{libspooles.so},
dnl #        @code{libspooles.a} or @code{spooles.a} and for header
dnl #        @var{incdir_spooles}/FrontMtx.h.
dnl #	     When this library is not available, the direct solver
dnl #        bases upon a traditionnal skyline Choleski factorisation
dnl #        combined with a reverse Cuthill-Mc Kee reordering.
dnl-------------------------------------------------------------------------
AC_ARG_WITH(spooles-incdir,
    [  --with-spooles-incdir[[=DIR]]   the spooles distributed direct solver includes directory],
    [  case "${withval}" in
          no)  with_spooles="no";;
          /*)  rheo_incdir_spooles=${with_spooles_incdir}
               if test x"${with_spooles}" != x"yes"; then
                   echo "    WARNING: turns on --with-spooles to use --with-spooles-incdir";
	       fi
               ;;
          *)   echo "    ERROR: bad value ${withval} for --with-spooles-incdir"; exit 1;;
       esac],
    [  rheo_incdir_spooles="" # will try to auto-detect from incdir
    ]
)
AC_ARG_WITH(spooles,
    [  --with-spooles-libdir[[=DIR]]   the spooles distributed direct solver library directory (default=no) ],
    [  case "${withval}" in
          no)  with_spooles="no";;
          /*)  rheo_libdir_spooles=${with_spooles}
	       with_spooles="yes"
               if test x"${rheo_have_taucs}" = x"yes"; then
                   echo "    ERROR: incompatible options taucs and spooles"; exit 1
	       fi
               if test x"${rheo_have_cln}" = x"yes"; then
                   echo "    ERROR: incompatible options cln/bigfloat and spooles"; exit 1
	       fi
               ;;
          *)   echo "    ERROR: bad value ${withval} for --with-spooles"; exit 1;;
       esac],
    [ with_spooles="no";
    ]
)
if test x"$rheo_enable_new_code" != x"yes"; then
  if test x"${rheo_have_mpi}" != x"yes" && test x"${with_spooles}" = x"yes" -a x"$rheo_have_umfpack" != x"yes" -a x"$rheo_have_taucs" != x"yes"; then
      # compiled spooles works with double...
      RHEO_CHECK_SPOOLES
  else
    rheo_have_spooles="no"
  fi
else
    rheo_have_spooles="no"
fi
dnl-------------------------------------------------------------------------
dnl for builtin LDLT sparses equential solver, when nothing else is available
dnl-------------------------------------------------------------------------
rheo_have_suitesparse_amd=no
AH_TEMPLATE([HAVE_SUITESPARSE_AMD], Defines if you have the amd suitesparse ordering library)
PREV_LIBS=${LIBS}
AC_SEARCH_LIBS([amd_order], [amd], rheo_have_suitesparse_amd=yes)
LIBS=${PREV_LIBS}
if test x"${rheo_have_suitesparse_amd}" = x"yes"; then
  AC_CHECK_HEADERS(suitesparse/amd.h, break, rheo_have_suitesparse_amd=no)
fi
AC_SUBST(INCLUDES_SUITESPARSE_AMD)
INCLUDES_SUITESPARSE_AMD=""
AC_SUBST(LDADD_SUITESPARSE_AMD)
if test x"$rheo_have_suitesparse_amd" = x"yes"; then
  AC_DEFINE(HAVE_SUITESPARSE_AMD)
  LDADD_SUITESPARSE_AMD="-lamd"
else
  LDADD_SUITESPARSE_AMD=""
fi
dnl-------------------------------------------------------------------------
dnl #@toindex cgal, computational geometry library
dnl #
dnl #    @item  --with-cgal-incdir=@var{incdir_cgal}
dnl #    @itemx --with-cgal-libdir=@var{libdir_cgal} 
dnl #        Turns on/off the @code{cgal} distributed solver.
dnl #        Check in @var{libdir_cgal} for @code{libcgal.so}, 
dnl #        or the corresponding @code{.a} libraries.
dnl #        Default is to auto-detect.
dnl-------------------------------------------------------------------------
with_cgal="yes"
rheo_incdir_cgal=""
rheo_libdir_cgal=""
#rheo_libs_cgal="-lCGAL_Core -lCGAL -lboost_thread"
rheo_libs_cgal="-lCGAL -lgmp"
AC_ARG_WITH(cgal-incdir,
    [  --with-cgal-incdir[[=DIR]]      the cgal computational geometry includes directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_incdir_cgal=""
                   with_cgal=${withval}
	       	   ;;
          *)       rheo_incdir_cgal=${withval}
		   with_cgal=yes
               	   ;;
       esac],
    [  rheo_incdir_cgal="" ]
)
AC_ARG_WITH(cgal-libdir,
    [  --with-cgal-libdir[[=DIR]]      the cgal computational geometry library directory (default=autodetect) ],
    [  case "${withval}" in
          yes|no)  rheo_libdir_cgal=""
                   with_cgal=${withval}
	       	   ;;
          *)       rheo_libdir_cgal=${withval}
		   with_cgal=yes
               	   ;;
       esac],
    [  rheo_libdir_cgal="" ]
)
AC_ARG_WITH(cgal-libs,
    [  --with-cgal-libs[[=LIBS]]       the cgal computational geometry library linker flags (default=-lCGAL) ],
    [  case "${withval}" in
          yes|no)  with_cgal=${withval};;
          *)       rheo_libs_cgal=${withval}
		   with_cgal=yes
               	   ;;
       esac]
)
if test x"$rheo_float_ext" != x""; then
  if test x"$with_cgal" = x"yes"; then
    echo "warning: unsupported cgal library with extended \"$rheo_float_ext\" feature" 1>&2
  fi
  with_cgal=no
fi
if test x"${with_cgal}" = x"yes"; then
  RHEO_CHECK_CGAL
fi
dnl-------------------------------------------------------------------------
dnl determine here if we use the distributed environment:
dnl-------------------------------------------------------------------------
AH_TEMPLATE([HAVE_MPI], Defines if you have distributed environment)
AC_SUBST(USE_DISTRIBUTED)
if test x"${rheo_use_distributed}" = x"yes"; then
    AC_DEFINE(HAVE_MPI)
    USE_DISTRIBUTED=true
else
    USE_DISTRIBUTED=false
    # un-activate: MPI, BOOST_MPI, SCOTCH & PARMETIS
dnl AC_MSG_RESULT(** WARNING: the distributed feature is turned off)
    MPIRUN=""
    INCLUDES_MPI=""
    LDADD_MPI=""
    INCLUDES_BOOST_MPI=""
    LDADD_BOOST_MPI=""
    INCLUDES_SCOTCH="" 
    LDADD_SCOTCH=""
    INCLUDES_PARMETIS="" 
    LDADD_PARMETIS="" 
fi
dnl-------------------------------------------------------------------------
dnl # Generic or hardware-dependant optimization
dnl use previous enable_optim and enable_debug
dnl => may be after debug and optim
dnl-------------------------------------------------------------------------
AC_ARG_ENABLE(generic,  [  --enable-generic        turn off hardware-dependant optimization options (default=yes)])
if test x"$rheo_have_float128" = x"yes"; then
  # float128 + i86 + SSE-optim => segfault
  AC_MSG_CHECKING(for float128 conflicts with hardware-specific optimization options)
  mach="`uname -m`"
  case $mach in
    i*86) enable_generic=yes;;
  esac
  AC_MSG_RESULT(${enable_generic})
fi
AC_ARG_ENABLE(optim,    [  --enable-optim          turn on compiler optimization (default=yes)])
AC_ARG_ENABLE(profiling,[  --enable-profiling      turn on profiling (default=no)])

m4_include(config/acmacros.m4)
m4_include(config/acoptim.m4)

# strip all possible -On flags and then force -O3
# note: use [...] to protect -O[0-9] regular expr
[
  res=`echo ${CXXFLAGS} | grep -e '-O[0-9]' >/dev/null`
  status=$?
  if test ${status} = 0; then
    CXXFLAGS=`echo ${CXXFLAGS} | sed -e 's/-O[0-9]//g'`
  fi
  CXXFLAGS="${CXXFLAGS} -O3"
]
dnl-------------------------------------------------------------------------
dnl #
dnl #    @item  --enable-optim
dnl #	     Turns compile-time optimization to maximum available.
dnl #	     Include architecture-dependent compilation (e.g. on intel, executable
dnl #        are less portable accross intel variants).
dnl #        Default is on.
dnl-------------------------------------------------------------------------
dnl AC_ARG_ENABLE(optim,
dnl     [  --enable-optim          compile-time architecture-dependent optimization mode (default=yes) ],
dnl     [  case "${enableval}" in
dnl           yes | no) enable_optim=${enableval};;
dnl           *)        enable_optim=yes;;
dnl        esac],
dnl     [ enable_optim=yes ]
dnl )
dnl # optimize or not ?
dnl if test x"${enable_optim}" = x"yes"; then
dnl     # architecture-dependent optim
dnl     RHEO_OPTIMIZE_CXX
dnl else
dnl     # architecture-independent optim, when no debug
dnl     if test x"${enable_debug}" != x"yes"; then
dnl       CXXFLAGS="-O3 ${CXXFLAGS}"
dnl     fi
dnl fi
dnl-------------------------------------------------------------------------
dnl   others variables
dnl-------------------------------------------------------------------------

dnl HAVE_GLOBAL_CONSTRUCTOR: uses global constructors in library
dnl since most compilers does not support it correctly, this is disable by default

dnl the date of the version:
DATE=`date +"%d/%m/%y %H:%M"`
dnl where executables and scripts can find auxilliary data:

dnl echo ${ac_n} "toto${ac_c}" = portable echo -n "toto" or echo "toto\c"
AC_SUBST(ac_n)
AC_SUBST(ac_c)
AC_SUBST(ac_t)

dnl-------------------------------------------------------------------------
dnl   Output
dnl-------------------------------------------------------------------------

AC_OUTPUT(				\
	Makefile			\
	config/Makefile			\
	config/config.mk		\
	util/Makefile			\
	util/dmallocxx/Makefile		\
	util/bigfloat/Makefile		\
	util/fdstream/Makefile		\
	util/ublas/Makefile		\
	util/bamg/Makefile		\
	util/lib/Makefile		\
	util/tst/Makefile		\
	skit/Makefile			\
	skit/lib/Makefile		\
	skit/tst/Makefile		\
	skit/plib2/Makefile		\
	skit/pbin/Makefile		\
	skit/ptst2/Makefile		\
	nfem/Makefile			\
	nfem/data/Makefile		\
	nfem/quadrature/Makefile	\
	nfem/geo_element/Makefile	\
	nfem/lib/Makefile		\
	nfem/plib/Makefile		\
	nfem/basis/Makefile		\
	nfem/gbasis/Makefile		\
	nfem/form_element/Makefile	\
	nfem/numbering/Makefile		\
	nfem/sbin/Makefile		\
	nfem/bin/Makefile		\
	nfem/pbin/Makefile		\
	nfem/vtk/Makefile		\
	nfem/tst/Makefile		\
	nfem/ptst/Makefile		\
	doc/Makefile			\
	doc/refman/Makefile		\
	doc/usrman/Makefile		\
	doc/pexamples/Makefile		\
	doc/pusrman/Makefile		\
	doc/doxygen/Makefile		\
)
dnl-------------------------------------------------------------------------
dnl libtool, 2nd pass
dnl-------------------------------------------------------------------------
dnl this 2nd pass may be after the AC_OUTPUT command, that generates the "libtool" script
dnl since we use this script here. Also, the "config.status" output was generated before 
dnl "libtool" was created, and the two variables calculated here cannot be added to "config.status"
dnl So, create an additional "config2.status"...

AC_MSG_CHECKING(for shlibpath variable name)
RHEOLEF_SHLIBPATH_VAR=`./libtool --config | grep -i "^shlibpath_var=" | sed -e 's/.*=//'`
AC_MSG_RESULT(${RHEOLEF_SHLIBPATH_VAR})

# add optional -rpath flag to linker ?
AC_MSG_CHECKING(for hardcode libdir flag spec)
libtool_rpath_sh="/tmp/libtool-rpath-$$.sh"
./libtool --config > $libtool_rpath_sh
echo "eval \"echo \$hardcode_libdir_flag_spec\"" >> $libtool_rpath_sh
RHEOLEF_HARDCODE_LIBDIR_FLAG_SPEC=`SED=sed exec_prefix=${exec_prefix} libdir=${libdir} sh $libtool_rpath_sh`
rm -f $libtool_rpath_sh
AC_MSG_RESULT(${RHEOLEF_HARDCODE_LIBDIR_FLAG_SPEC})

dnl if test x"$debian_packaging" = x"yes"; then
dnl  # rpath issue for debian package: seems to be buggy with DESTDIR!=""
dnl   RHEO_DEBIAN_FIX_LIBTOOL
dnl fi

# then output results to "config2.status"
output2="config2.status"
rm -f $output2
echo "#!/bin/sh" >> $output2
echo "# File automatically generated by configure." >> $output2
echo "exec_prefix=\"${exec_prefix}\"" >> $output2
echo "RHEOLEF_SHLIBPATH_VAR=\"${RHEOLEF_SHLIBPATH_VAR}\"" >> $output2
echo "RHEOLEF_HARDCODE_LIBDIR_FLAG_SPEC=\"${RHEOLEF_HARDCODE_LIBDIR_FLAG_SPEC}\"" >> $output2
echo "configure: creating $output2"

dnl-------------------------------------------------------------------------
dnl add a _RHEOLEF_ prefix to #defined macros
dnl-------------------------------------------------------------------------

/bin/sh $srcdir/config/rheolef_config_header.sh \
	< config/acconfig.h 			\
	> config/config.h.new

if test -f config/config.h.cache && diff config/config.h.cache config/config.h.new >/dev/null; then
    cp -a config/config.h.cache config/config.h
    echo "configure: config/config.h is unchanged"
else
    mv config/config.h.new config/config.h
    echo "configure: creating config/config.h"
fi
echo "configure: creating config/config.mk"

dnl-------------------------------------------------------------------------
dnl summary
dnl-------------------------------------------------------------------------
status=0
echo "------------------------------------------------"
echo "summary:"
echo "	prefix	         : ${prefix}"
echo "	c++ compiler	 : ${rheo_cxx}"
if test x"${enable_optim}" = x"yes"; then
  echo "	optimization	 : machine-dependent"
else
  echo "	optimization	 : machine-independent"
fi
if test x"${rheo_have_boost}" = x"yes"; then
  echo "	boost	         : yes"
else
  echo "	boost	         : *NO*"
  status=1
fi
echo "	ginac	         : ${rheo_have_ginac}"
# new code case:
if test x"${rheo_enable_new_code}" = x"yes"; then
  if test x"${rheo_float_ext}" != x""; then
      echo "	arithmetic       : ${rheo_float_ext} (extended)"
  fi
  if test x"${with_cgal}" = x"yes"; then
      echo "	geometry         : cgal"
  else
      echo "	geometry         : *NONE*"
      if test x"${with_extended_arithmetic}" != x"yes"; then
        status=1; # no geo locator and characteristic
      fi
  fi
  solvers=""
  if test x"${rheo_have_mumps}" = x"yes"; then
      solvers="${solvers}mumps " 
      if test x"${rheo_have_mpi}" = x"yes"; then
        solvers="${solvers}(distributed) " 
      fi
  fi
  if test x"${rheo_have_pastix}" = x"yes"; then
      solvers="${solvers}pastix "
      if test x"${rheo_have_mpi}" = x"yes"; then
        solvers="${solvers}(distributed) " 
      fi
  fi
  if test x"${rheo_have_cholmod}" = x"yes"; then
      solvers="${solvers}cholmod "
  fi
  if test x"${rheo_have_umfpack}" = x"yes"; then
      solvers="${solvers}umfpack "
  fi
  if test x"${rheo_have_umfpack}" = x"yes" -o x"${rheo_have_cholmod}" = x"yes"; then
    if test x"${rheo_have_mpi}" = x"yes"; then
      solvers="${solvers}(sequential) " 
    fi
  fi
  if test x"$solvers" == x""; then
      solvers="builtin"
  fi
  echo "	direct solver    : $solvers"
  if test x"${rheo_have_trilinos}" = x"yes"; then
      echo "	preconditioners  : trilinos/ifpack"
  elif test x"${rheo_have_pastix}" = x"yes"; then
      echo "	preconditioners  : pastix"
  else
      echo "	preconditioners  : builtin"
  fi
  if test x"${rheo_use_distributed}" = x"yes"; then
    if test x"${rheo_have_scotch}" = x"yes"; then
      echo "	partitioner      : scotch"
    elif test x"${rheo_have_parmetis}" = x"yes"; then
      echo "	partitioner      : parmetis"
    else
      echo "	partitioner      : *NONE*"
      status=1
    fi
    if test x"${rheo_have_mpi}" = x"yes"; then
      if test x"${rheo_recognized_mpi}" != x"no"; then
        echo "	mpi	         : ${rheo_recognized_mpi}"
      else
        echo "	mpi	         : yes"
      fi
    else
      echo "	mpi	         : *NONE*"
      status=1
    fi
  fi
  echo "	distributed      : ${rheo_use_distributed}"
else # old sequential case:
  echo "	old code branch  : yes"
  if test x"${rheo_have_umfpack}" = x"yes"; then
      echo "	solver	         : umfpack"
  elif test x"${rheo_have_spooles}" = x"yes"; then
      echo "	solver	         : spooles"
  elif test x"${rheo_have_taucs}" = x"yes"; then
      echo "	solver	         : taucs"
  else
      echo "	solver	         : *NONE*"
      if test x"${with_extended_arithmetic}" != x"yes"; then
        status=1; # else : experimental (no direct solver yet)
      fi
  fi
fi
if test ${status} -ne 0; then
  echo "configure: ERROR: some required library are not found"
  exit 1
else
  if test x"${rheo_use_distributed}" = x"yes" -a x"${rheo_enable_new_code}" = x"yes" -a x"${with_mumps}" = x"yes"; then
    if test x"${rheo_have_mumps_with_ptscotch}" != x"yes" -a x"${rheo_have_mumps_with_parmetis}" != x"yes" -a x"${rheo_have_mumps_with_scotch}" != x"yes" -a x"${rheo_have_mumps_with_metis}" != x"yes"; then
      echo "WARNING: mumps founded but compiled without (pt)scotch or (par)metis ordering support"
      echo "HINT:    for a better efficiency, mumps should be recompiled with one of these support"
    fi
  fi
fi
echo "------------------------------------------------"
dnl #@end table
dnl-------------------------------------------------------------------------
dnl   End of configure script: rest of the documenttion
dnl-------------------------------------------------------------------------
dnl #THE DIRECTORY STRUCTURE:
dnl #@table @code
dnl #  @item config
dnl #		portability related files and documentation extractors
dnl #  @item util
dnl #		a collection of useful C++ classes 
dnl #  		and functions for smart pointers,
dnl #  		handling files and directories, using strings, timing.
dnl #  @item skit
dnl #	 	sparse matrix library, linear solvers.
dnl #  @item nfem
dnl # 		finite element library, mesh, spaces and forms.
dnl #  @item doc
dnl # 		reference manual, user's guide and examples.
dnl #@end table
dnl #
dnl #AUTHOR:
dnl #    LMC-IMAG, 38041 Grenoble cedex 9, France
dnl #    @email{Pierre.Saramito@@imag.fr}
dnl #DATE:
dnl #    19 january 1999
dnl #End:
dnl=========================================================================