Installation Instructions for PSI3
----------------------------------

  I. Compilation Prerequisites
  II. Brief Summary of Configruation, Compilation, and Installation
  III. Detailed Installation Instructions
  IV. Recommendations for BLAS and LAPACK libraries
  V. Miscellaneous architecture-specific notes

----------------------------------

I. Compilation Prerequisites:

   * ANSI C compiler
   * C++ Compiler
   * F77 Compiler (the F95 compiler, gfortran, with gcc-4.X will work)
     --> Note: The F77 compiler is only used to determine the symbol-naming
     convention of and some system routines for the BLAS and LAPACK libraries
     on a few architectures.  It is optional in a few cases (e.g. Mac OS X
     systems).
   * Optimized BLAS library (see recommendations below)
   * Optimized LAPACK library (see recommendations below)
   * POSIX threads (Pthreads) library (optional)
   * Perl interpreter (5.005 or higher; needed for running test cases)
   * GNU utilities: (see http://www.gnu.org)
      ** make
      ** flex
      ** bison
      ** autoconf (version 2.52 or higher)
      ** fileutils (esp. install)
   * For documentation:
      ** latex
      ** latex2html 
           (for generating web-based documentation only; either v0.99_1 or 
            1.62, but you must apply the patch supplied in psi3/misc)

II. Brief Summary of Configruation, Compilation, and Installation

A good directory for the PSI3 source code is /usr/local/src/psi3.
The directory should NOT be named /usr/local/psi, as that is the default
installation directory unless changed by the --prefix directive (see below).
It should also not have any periods in the path, e.g., /usr/local/psi3.2,
because of a bug in dvips which will cause the compilation of documentation
to fail.

The following series of steps will configure and build the PSI3 package
and install the executables in /usr/local/psi/bin:

   * cd $PSI3 (the top-level PSI3 source directory -- probably THIS directory)
   * mkdir objdir
   * cd objdir
   * ../configure
   * make
   * make tests (optional, but recommended)
   * make install
   * make doc (optional)

You may need to make use of one or more of the following options to
the configure script:

   * --prefix=directory --- Use this option if you wish to install the
   PSI3 package somewhere other than the default directory, /usr/local/psi.

   * --with-cc=compiler --- Use this option to specify a C compiler.
   One should use compilers that generate reentrant code, if possible. The
   default search order for compilers is: cc_r (AIX only), gcc, icc, cc.

   * --with-cxx=compiler --- Use this option to specify a C++ compiler.
   One should use compilers that generate reentrant code, if possible.
   The default search order for compilers is: xlC_r (AIX only), g++, c++,
   icpc, cxx.

   * --with-fc=compiler --- Use this option to specify a Fortran-77 compiler,
   which is used to determine linking coventions for BLAS and LAPACK libraries
   and to provide system routines for those libraries.  Note that no fortran
   compiler is necessary on Mac OS X systems (see below).  The default search
   order for compilers is: xlf_r (AIX only), gfortran, g77, ifort, f77, f2c.

   * --with-f77symbol=value --- This option allows manual assignment of the 
   FORTRAN77 symbol convention, which is necessary for C programs to link
   Fortran-interface libraries such as BLAS and LAPACK. This option should
   only be used by experts and even then should almost never be necessary. 
   Allowed values are:
                            lc  : lower-case
                            lcu : lower-case with underscore (default)
                            uc  : upper-case
                            ucu : upper-case with underscore

   * --with-ld=linker --- Use this option to specify a linker.  The
   default is 'ld'.

   * --with-ar=archiver --- Use this option to specify an archiver.  The
   default is to look for 'ar' automatically.

   * --with-ar-flags=flags --- Use this option to specify additional archiver 
   flags. The default is 'r'.

   * --with-incdirs=directories --- Use this option to specify extra
   directories where to look for header files. Directories should be specified
   prepended by '-I', i.e. '-Idir1 -Idir2', etc. If several directories are 
   specified, enclose the list with single right-quotes, e.g.,
   --with-incdirs='-I/usr/local/include -I/home/psi3/include'.

   * --with-libs=libraries --- Use this option to specify extra
   libraries which should be used during linking. Libraries should be 
   specified by their full names or in the usual '-l' notation, e.g. 
   '-lm /usr/lib/libm.a', etc.  If several libraries are specified, enclose 
   the list with single right-quotes, e.g., --with-libs='-libm -lgcc_s'.

   * --with-libdirs=directories --- Use this option to specify extra
   directories where to look for libraries. Directories should be specified
   prepended by '-L', i.e. '-Ldir1 -Ldir2', etc. If several directories are 
   specified, enclose the list with single right-quotes, e.g.,
   --with-libdirs='-L/usr/local/lib -I/home/psi3/lib'.

   * --with-blas=library --- Use this option to specify a BLAS library.
   If your BLAS library has multiple components, enclose the file list
   with single right-quotes, e.g., --with-blas='-lf77blas -latlas'.  Note
   that many BLAS libraries can be detected automatically.

   * --with-lapack=library --- Use this option to specify a LAPACK library.
   If your LAPACK library has multiple components, enclose the file list
   with single right-quotes, e.g., --with-lapack='-llapack -lcblas -latlas'.
   Note that many LAPACK libraries can be detected automatically.

   * --with-max-am-eri=integer --- Specifies the maximum angular momentum
   level for the primitive Gaussian basis functions when computing
   electron repulsion integrals.  This is set to g-type functions (AM=4)
   by default.

   * --with-max-am-deriv1=integer --- Specifies the maximum angular
   momentum level for first derivatives of the primitive Gaussian
   basis functions.  This is set to f-type functions (AM=3) by default.

   * --with-max-am-deriv2=integer --- Specifies the maximum angular
   momentum level for second derivatives of the primitive Gaussian
   basis functions.  This is set to d-type functions (AM=2) by default.

   * --with-max-am-r12=integer --- Specifies the maximum angular momentum
   level for primitive Gaussian basis functions used in r_12 explicitly
   correlated methods.  This is set to f-type functions (AM=3) by default.

   * --with-debug=yes/no --- Turns on debugging flags (-g) if yes.  This is
   set to no by default.

   * --with-opt=yes/no --- Turns off compiler optimizations (-OX) if no.
   This is set to yes by default.

   * --with-strict=yes -- Turns on strict compiler warnings.

III. Detailed Installation Instructions

This section provides a more detailed explanation of the procedure for
compiling and installing the PSI3 package.

III.A. Step 1: Configuration

First, we recommend that you choose for the top-level $PSI3 source
directory something other than /usr/local/psi; your $HOME directory or
/usr/local/src/psi3 are convenient choices.  Next, in the top-level $PSI3
source directory you've chosen, first run autoconf to generate the configure
script from configure.ac.  It is best to keep the source code separate
from the compilation area, so you must first choose a subdirectory for
compilation of the codes.  A simple option is $PSI3/objdir, which should
work for most environments.  However, if you need executables for several
architectures, you should choose more meaningful subdirectory names.

   * The compilation directory will be referred to as $objdir for the
   remainder of these instructions.

In $objdir, run the configure script found in the $PSI3 top-level source
directory.  This script will scan your system to locate certain libraries,
header files, etc. needed for complete compilation.  The script accepts a
number of options, all of which are listed above.  The most important of
these is the --prefix option, which selects the installation directory for
the executables, the libraries, header files, basis set data, and other
administrative files.  The default --prefix is /usr/local/psi.

   * The configure script's --prefix directory will be referred to as
   $prefix for the remainder of these instructions.

III.B. Step 2: Compilation

Running "make" (which must be GNU's 'make' utility) in $objdir will compile
the PSI3 libraries and executable modules.

III.C. Step 3: Testing

To execute automatically the ever-growing number of test cases after
compilation, simply execute "make tests" in the $objdir directory.
This will run each (relatively small) test case and report the results.
Failure of any of the test cases should be reported to the developers.
By default, any such failure will stop the testing process.  If you desire
to run the entire testing suit without interruption, execute "make tests
TESTFLAGS='-u -q'". Note that you must do a "make testsclean" in $objdir
to run the test suite again.

III.D. Step 4: Installation

Once testing is complete, installation into $prefix is accomplished by
running "make install" in $objdir.   Executable modules are installed in
$prefix/bin, libraries in $prefix/lib, and basis set data and other control
strctures $prefix/share.

III.E. Step 5: Building Documentation

If your system has the appropriate utilities, you may build the
package documentation from the top-level $objdir by running "make doc".
The resulting files will appear in the $prefix/doc area.

III.F. Step 6: Cleaning

All object files and libraries can be removed to save disk space by running
"make clean" in $objdir.

III.G. Step 7: User Configuration

After the PSI3 package has been successfullly installed, the user will need
to add the installation directory into his/her path.  If the package has
been installed in the default location /usr/local/psi, then in C shell,
the user should add something like the following to their .cshrc file:

setenv PSI /usr/local/psi
set path = ($path $PSI/bin)
setenv MANPATH $PSI/doc/man:$MANPATH

The final line will enable the use of the PSI3 man pages.

IV. Recommendations for BLAS and LAPACK libraries

Much of the speed and efficiency of the PSI3 programs depends on the
corresponding speed and efficiency of the available BLAS and LAPACK libraries
(especially the former).  In addition, the most common compilation problems
involve these libraries.  Users may therefore wish to consider the following
BLAS and LAPACK recommendations when building PSI3:

  (1) It is NOT wise to use the stock BLAS library provided with many
  Linux distributions like RedHat.  This library is usually just the
  netlib distribution and is completely unoptimized.  PSI3's performance
  will suffer if you choose this route.  The choice of LAPACK is less
  critical, and so the unoptimized netlib distribution is acceptable.
  If you do choose to use the RedHat/Fedora stock BLAS and LAPACK, be
  aware that some RPM's do not make the correct symbolic links.  
  For example, you may have /usr/lib/libblas.so.3.1.0 but not
  /usr/lib/libblas.so.  If this happens, create the link as, e.g.,
  ln -s /usr/lib/libblas.so.3.1.0 /usr/lib/libblas.so.  You
  may need to do similarly for lapack.

  (2) Perhaps the best choices for BLAS are Kazushige Goto's hand-optimized
  BLAS (http://www.tacc.utexas.edu/resources/software/) and ATLAS
  (http://math-atlas.sourceforge.net/).  These work well on nearly every
  achitecture to which the PSI3 developers have access, though we have
  identified at least one case in which the Goto libraries yielded faulty
  DGEMM calls.  On Mac OS X systems, however, the vecLib package that comes
  with Xcode works well.  Note also that we have encountered problems with the
  version 10 of Intel's MKL, particularly for very large coupled cluster
  calculations.

  (3) PSI3 does not require a Fortran compiler, unless the resident BLAS
  and LAPACK libraries require Fortran-based system libraries.  If you see
  compiler complaints about missing symbols like "do_fio" or "e_wsfe", then
  your libraries were most likely compiled with g77 or gfortran, which
  require -lg2c to resolve the Fortran I/O calls.  Use of the same gcc
  package for PSI3 should normally resolve this problem.

  (4) The PSI3 configure script can often identify and use several
  different BLAS and LAPACK libraries, but its ability to do this
  automatically depends on a number of factors, including correspondence
  between the compiler used for PSI3 and the compiler used to build
  BLAS/LAPACK, placement of the libraries in commonly searched directories,
  etc. PSI3's configure script will find your BLAS and LAPACK if any of the
  the following are installed in standard locations (e.g. /usr/local/lib):

    (a) ATLAS: libf77blas.a and libatlas.a, plus netlib's liblapack.a
    (b) MKL 8: libmkl.so and libmkl_lapack64.a (with the corresponding
        Intel compilers)
    (c) Goto: libgoto.a and netlib's liblapack.a
    (d) Cray SCSL (e.g. on SGI Altix): libscs.so (NB: No Fortran compiler
        is necessary in this case, so --with-fc=no should work.)
    (e) ESSL (e.g. on AIX systems): libessl.a

  (5) If configure cannot identify your BLAS and LAPACK libraries
  automatically, you can specify them on the command-line using the
  --with-blas and --with-lapack arguments described above.  Here are a few
  examples that work on the PSI3 developers' systems:

    (a) Linux with ATLAS:

    --with-blas='-lf77blas -latlas' --with-lapack='-llapack -lcblas'

    (b) Mac OS X with vecLib:

    --with-blas='-altivec -framework vecLib' --with-lapack=' '

    (c) Linux with MKL 8.1 and icc/icpc/ifort 9.1:

    --with-libdirs=-L/usr/local/opt/intel/mkl/8.0.2/lib/32 --with-blas=-lmkl --with-lapack=-lmkl_lapack32

    (d) Linux on ia32 with MKL 10.1 and icc/icpc 11.0:

    --with-blas='-Wl,--start-group -L/usr/local/opt/intel/mkl/10.1.0.015/lib/32 -l mkl -Wl,--end-group -lguide -lpthread'

V. Miscellaneous architecture-specific notes

  * Linux on x86 and x86_64:

   (1) gcc compiler: versions 3.2, 3.3, 3.4, 4.0, and 4.1 have been tested.

   (2) Intel compilers: versions 9.0 and 11.0 have been tested. We do not 
   recommend using version 8.1.

   (3) Portland Group compilers: version 6.0-5 has been tested.

   (4) Some versions of RedHat/Fedora Core RPM packages for the 
   BLAS and LAPACK libraries fail to make all the required symlinks.  
   For example, you may have /usr/lib/libblas.so.3.1.0 but not
   /usr/lib/libblas.so.  If this happens, create the link as, e.g.,
   ln -s /usr/lib/libblas.so.3.1.0 /usr/lib/libblas.so.  You
   may need to do something similar for LAPACK.

  * Linux on Itanium2 (IA64):

   (1) Intel compiler versions 9.0 and 10.0 have been tested and work. 
   Version 8.1 does not work.

   (2) gcc compilers work.

 * Mac OS 10.X:

   (1) The compilation requires a developer's toolkit (Xcode) from apple.com.
   Note that a fortran compiler is not needed for PSI 3.4 on Mac OS X systems.

   (2) The libcompat.a library is no longer needed as of 1/24/2008.

   (3) For apple systems, the latest configure script assumes that the vecLib
   will be used for the optimized BLAS and LAPACK libraries, unless the
   user indicates otherwise using the --with-blas and --with-lapack flags
   to configure.  If you encounter difficulty with configure, you may have
   success explicitly indicating the vecLib using:

      --with-blas='-altivec -framework vecLib' --with-lapack=' '

   (4) Pre Mac OS 10.4: Certain PSI3 codes require significant stackspace for
   compilation.  Increase your shell's stacksize limit before running "make".
   For csh, for example, this is done using "unlimit stacksize".  [NB: This
   limit appears to have been lifted in Mac OS 10.3.X (Panther).]

   (5) Mac 10.5 users can take advantage of the ruby driver in PSI 3.4 by
   including the following options on the configure command line:

   --with-ruby-include="-I/System/Library/Frameworks/Ruby.framework/Headers"
   --with-ruby-lib="-framework Ruby"

 * AIX in a 64-bit environment:

   We do not presently support the use of XL compilers on AIX systems.  We
   have tested gcc-4.1.1 under AIX 5.3, and we recommend use of the
   configure flag: --with-aix64.

 * SGI IRIX 6.x:

   (1) MIPSpro C++ compilers prior to version 7.4 require a command-line flag
   '-LANG:std' in order to compile PSI3 properly.

   (2) Use command-line flag '-64' in order to produce 64-bit executables with
   MIPSpro compilers. The following is an example of appropriate configure 
   options:

    --with-cc='cc -64' --with-cxx='CC -64 -LANG:std' --with-fc='f77 -64'

   (3) Under IRIX, configure will attempt to detect automatically and use
   the optimized SGI Scientific Computing Software Library (SCSL).

 * Compaq Alpha/OSF 5.1:

   Default Bourne shell under Tru64 (/bin/sh) is not POSIX-compliant which 
   causes some PSI3 makefiles to fail. Set environmental variable BIN_SH to 
   xpg4.