File: acinclude.m4

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dnl @synopsis AC_CHECK_CC_OPT(flag, cachevarname)
dnl 
dnl AC_CHECK_CC_OPT(-fvomit-frame,vomitframe)
dnl would show a message as like 
dnl "checking wether gcc accepts -fvomit-frame ... no"
dnl and sets the shell-variable $vomitframe to either "-fvomit-frame"
dnl or (in this case) just a simple "". In many cases you would then call 
dnl AC_SUBST(_fvomit_frame_,$vomitframe) to create a substitution that
dnl could be fed as "CFLAGS = @_funsigned_char_@ @_fvomit_frame_@
dnl
dnl in consequence this function is much more general than their 
dnl specific counterparts like ac_cxx_rtti.m4 that will test for
dnl -fno-rtti -fno-exceptions
dnl 
dml @author  Guido Draheim <guidod@gmx.de>

AC_DEFUN([AC_CHECK_CC_OPT],
[AC_CACHE_CHECK(whether ${CC-cc} accepts [$1], [$2],
[AC_SUBST($2)
echo 'void f(){}' > conftest.c
if test -z "`${CC-cc} -c $1 conftest.c 2>&1`"; then
  $2="$1"
else
  $2=""
fi
rm -f conftest*
])])

dnl @synopsis AC_C_LONG_LONG
dnl
dnl Provides a test for the existance of the long long int type and
dnl defines HAVE_LONG_LONG if it is found.
dnl
dnl @author Caolan McNamara <caolan@skynet.ie>
dnl
AC_DEFUN([AC_C_LONG_LONG],
[AC_CACHE_CHECK(for long long int, ac_cv_c_long_long,
[if test "$GCC" = yes; then
  ac_cv_c_long_long=yes
  else
        AC_TRY_COMPILE(,[long long int i;],
   ac_cv_c_long_long=yes,
   ac_cv_c_long_long=no)
   fi])
   if test $ac_cv_c_long_long = yes; then
     AC_DEFINE(HAVE_LONG_LONG)
   fi
])

# RSSH_CHECK_SUNPROC_CC([ACTION-IF-YES], [ACTION-IF-NOT])
# ------------------------------------------------------
# check : are we using SUN C++ compiler.
#  Corresponding cache value: rssh_cv_check_sunpro_cc is set to yes or no
#
#@author  Ruslan Shevchenko <Ruslan@Shevchenko.Kiev.UA>, 1998, 2000
#@version $Id$
#
#  RSSH_CHECK_SUNPRO_CC([ACTION-IF-YES],[ACTION-IF-NOT])
#
AC_DEFUN([RSSH_CHECK_SUNPRO_CC],
[AC_CACHE_CHECK([whether using Sun C++ compiler],
                [rssh_cv_check_sunpro_cc],

[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([],
[#ifndef __SUNPRO_CC
# include "error: this is not Sun C++ Compiler."
#endif
],
               rssh_cv_check_sunpro_cc=yes,
               rssh_cv_check_sunpro_cc=no)
AC_LANG_RESTORE])
if test ${rssh_cv_check_sunpro_cc} = yes
then
  $2
  :
else 
  $3
  :
fi
])# RSSH_CHECK_SUNPROC_CC

# RSSH_CHECK_SUNPROC_C([ACTION-IF-YES], [ACTION-IF-NOT])
# ------------------------------------------------------
# check : are we using SUN C compiler.
#  Corresponding cache value: rssh_cv_check_sunpro_c is set to yes or no
#
#@author  Ruslan Shevchenko <Ruslan@Shevchenko.Kiev.UA>, 1998, 2000
#@version $Id$
#
#  RSSH_CHECK_SUNPRO_C([ACTION-IF-YES],[ACTION-IF-NOT])
#
AC_DEFUN([RSSH_CHECK_SUNPRO_C],
[AC_CACHE_CHECK([whether using Sun C compiler],
                [rssh_cv_check_sunpro_c],

[AC_LANG_SAVE
 AC_LANG_C
 AC_TRY_COMPILE([],
[#ifndef __SUNPRO_C
# include "error: this is not Sun C Compiler."
#endif
],
               rssh_cv_check_sunpro_c=yes,
               rssh_cv_check_sunpro_c=no)
AC_LANG_RESTORE])
if test ${rssh_cv_check_sunpro_c} = yes
then
  $2
  :
else 
  $3
  :
fi
])# RSSH_CHECK_SUNPRO_C


dnl @synopsis AC_CXX_BOOL
dnl
dnl If the compiler recognizes bool as a separate built-in type,
dnl define HAVE_BOOL. Note that a typedef is not a separate
dnl type since you cannot overload a function such that it accepts either
dnl the basic type or the typedef.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_BOOL],
[AC_CACHE_CHECK(whether the compiler recognizes bool as a built-in type,
ac_cv_cxx_bool,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([int f(int  x){return 1;}
int f(char x){return 1;}
int f(bool x){return 1;}
],[bool b = true; return f(b);],
 ac_cv_cxx_bool=yes, ac_cv_cxx_bool=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_bool" = yes; then
  AC_DEFINE(HAVE_BOOL,,[define if bool is a built-in type])
fi
])


dnl @synopsis AC_CXX_CONST_CAST
dnl
dnl If the compiler supports const_cast<>, define HAVE_CONST_CAST.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_CONST_CAST],
[AC_CACHE_CHECK(whether the compiler supports const_cast<>,
ac_cv_cxx_const_cast,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE(,[int x = 0;
const int& y = x;
int& z = const_cast<int&>(y);
return z;],
 ac_cv_cxx_const_cast=yes, ac_cv_cxx_const_cast=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_const_cast" = yes; then
  AC_DEFINE(HAVE_CONST_CAST,,[define if the compiler supports const_cast<>])
fi
])


dnl @synopsis AC_CXX_DEFAULT_TEMPLATE_PARAMETERS
dnl
dnl If the compiler supports default template parameters,
dnl define HAVE_DEFAULT_TEMPLATE_PARAMETERS.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_DEFAULT_TEMPLATE_PARAMETERS],
[AC_CACHE_CHECK(whether the compiler supports default template parameters,
ac_cv_cxx_default_template_parameters,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([template<class T = double, int N = 10> class A {public: int f() {return 0;}};
],[A<float> a; return a.f();],
 ac_cv_cxx_default_template_parameters=yes, ac_cv_cxx_default_template_parameters=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_default_template_parameters" = yes; then
  AC_DEFINE(HAVE_DEFAULT_TEMPLATE_PARAMETERS,,
            [define if the compiler supports default template parameters])
fi
rm -rf SunWS_cache
])


dnl @synopsis AC_CXX_EXCEPTIONS
dnl
dnl If the C++ compiler supports exceptions handling (try,
dnl throw and catch), define HAVE_EXCEPTIONS.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_EXCEPTIONS],
[AC_CACHE_CHECK(whether the compiler supports exceptions,
ac_cv_cxx_exceptions,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE(,[try { throw  1; } catch (int i) { return i; }],
 ac_cv_cxx_exceptions=yes, ac_cv_cxx_exceptions=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_exceptions" = yes; then
  AC_DEFINE(HAVE_EXCEPTIONS,,[define if the compiler supports exceptions])
fi
])

dnl @synopsis AC_CXX_EXPLICIT
dnl
dnl If the compiler can be asked to prevent using implicitly one argument
dnl constructors as converting constructors with the explicit
dnl keyword, define HAVE_EXPLICIT.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_EXPLICIT],
[AC_CACHE_CHECK(whether the compiler supports the explicit keyword,
ac_cv_cxx_explicit,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([class A{public:explicit A(double){}};],
[double c = 5.0;A x(c);return 0;],
 ac_cv_cxx_explicit=yes, ac_cv_cxx_explicit=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_explicit" = yes; then
  AC_DEFINE(HAVE_EXPLICIT,,[define if the compiler supports the explicit keyword])
fi
])


dnl @synopsis AC_CXX_HAVE_STD
dnl
dnl If the compiler supports ISO C++ standard library (i.e., can include the
dnl files iostream, map, and iomanip), define HAVE_STD.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_HAVE_STD],
[AC_CACHE_CHECK(whether the compiler supports ISO C++ standard library,
ac_cv_cxx_have_std,
[AC_REQUIRE([AC_CXX_NAMESPACES])
 AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([#include <iostream>
#include <map>
#include <iomanip>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif],[return 0;],
 ac_cv_cxx_have_std=yes, ac_cv_cxx_have_std=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_have_std" = yes; then
  AC_DEFINE(HAVE_STD,,[define if the compiler supports ISO C++ standard library])
fi
])


dnl @synopsis AC_CXX_HAVE_STL
dnl
dnl If the compiler supports the Standard Template Library, define HAVE_STL.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_HAVE_STL],
[AC_CACHE_CHECK(whether the compiler supports Standard Template Library,
ac_cv_cxx_have_stl,
[AC_REQUIRE([AC_CXX_NAMESPACES])
 AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([#include <list>
#include <deque>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif],[list<int> x; x.push_back(5);
list<int>::iterator iter = x.begin(); if (iter != x.end()) ++iter; return 0;],
 ac_cv_cxx_have_stl=yes, ac_cv_cxx_have_stl=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_have_stl" = yes; then
  AC_DEFINE(HAVE_STL,,[define if the compiler supports Standard Template Library])
fi
rm -rf SunWS_cache
])

dnl @synopsis AC_CXX_IOS_BINARY
dnl
dnl If the compiler supports ios::binary
dnl
dnl @author The Written Word, Inc.
dnl
AC_DEFUN([AC_CXX_IOS_BINARY],
[AC_CACHE_CHECK(whether the compiler supports ios::binary,
ac_cv_cxx_ios_binary,
[AC_LANG_PUSH(C++)
 AC_TRY_COMPILE([#include <fstream>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif],[
ifstream in( "/dev/null", ios::binary );],
 ac_cv_cxx_ios_binary=yes, ac_cv_cxx_ios_binary=no)
 AC_LANG_POP(C++)
])
if test "$ac_cv_cxx_ios_binary" = no; then
  AC_DEFINE(MISSING_STD_IOS_BINARY,,[define if the compiler lacks ios::binary])
fi
rm -rf SunWS_cache
])

dnl @synopsis AC_CXX_MEMBER_TEMPLATES_OUTSIDE_CLASS
dnl
dnl If the compiler supports member templates outside the class declaration,
dnl define HAVE_MEMBER_TEMPLATES_OUTSIDE_CLASS.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_MEMBER_TEMPLATES_OUTSIDE_CLASS],
[AC_CACHE_CHECK(whether the compiler supports member templates outside the class declaration,
ac_cv_cxx_member_templates_outside_class,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([
#template<class T, int N> class A
{ public :
  template<int N2> A<T,N> operator=(const A<T,N2>& z);
};
template<class T, int N> template<int N2>
A<T,N> A<T,N>::operator=(const A<T,N2>& z){ return A<T,N>(); }],[
A<double,4> x; A<double,7> y; x = y; return 0;],
 ac_cv_cxx_member_templates_outside_class=yes, ac_cv_cxx_member_templates_outside_class=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_member_templates_outside_class" = yes; then
  AC_DEFINE(HAVE_MEMBER_TEMPLATES_OUTSIDE_CLASS,,
            [define if the compiler supports member templates outside the class declaration])
fi
rm -rf SunWS_cache
])


dnl @synopsis AC_CXX_MUTABLE
dnl
dnl If the compiler allows modifying class data members flagged with
dnl the mutable keyword even in const objects (for example in the
dnl body of a const member function), define HAVE_MUTABLE.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_MUTABLE],
[AC_CACHE_CHECK(whether the compiler supports the mutable keyword,
ac_cv_cxx_mutable,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([class A { mutable int i;
          public:
          int f (int n) const { i = n; return i; }
        };
],[A a; return a.f (1);],
 ac_cv_cxx_mutable=yes, ac_cv_cxx_mutable=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_mutable" = yes; then
  AC_DEFINE(HAVE_MUTABLE,,[define if the compiler supports the mutable keyword])
fi
])



dnl @synopsis AC_CXX_NAMESPACES
dnl
dnl If the compiler can prevent names clashes using namespaces, define
dnl HAVE_NAMESPACES.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_NAMESPACES],
[AC_CACHE_CHECK(whether the compiler implements namespaces,
ac_cv_cxx_namespaces,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([namespace Outer { namespace Inner { int i = 0; }}],
                [using namespace Outer::Inner; return i;],
 ac_cv_cxx_namespaces=yes, ac_cv_cxx_namespaces=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_namespaces" = yes; then
  AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces])
fi
])


dnl @synopsis AC_CXX_NEW_FOR_SCOPING
dnl
dnl If the compiler accepts the new for scoping rules (the scope of a
dnl variable declared inside the parentheses is restricted to the
dnl for-body), define HAVE_NEW_FOR_SCOPING.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_NEW_FOR_SCOPING],
[AC_CACHE_CHECK(whether the compiler accepts the new for scoping rules,
ac_cv_cxx_new_for_scoping,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE(,[  int z = 0;
  for (int i = 0; i < 10; ++i)
    z = z + i;
  for (int i = 0; i < 10; ++i)
    z = z - i;
  return z;],
 ac_cv_cxx_new_for_scoping=yes, ac_cv_cxx_new_for_scoping=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_new_for_scoping" = yes; then
  AC_DEFINE(HAVE_NEW_FOR_SCOPING,,[define if the compiler accepts the new for scoping rules])
fi
])

dnl @synopsis AC_CXX_STATIC_CAST
dnl
dnl If the compiler supports static_cast<>, define HAVE_STATIC_CAST.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_STATIC_CAST],
[AC_CACHE_CHECK(whether the compiler supports static_cast<>,
ac_cv_cxx_static_cast,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([#include <typeinfo>
class Base { public : Base () {} virtual void f () = 0; };
class Derived : public Base { public : Derived () {} virtual void f () {} };
int g (Derived&) { return 0; }],[
Derived d; Base& b = d; Derived& s = static_cast<Derived&> (b); return g (s);],
 ac_cv_cxx_static_cast=yes, ac_cv_cxx_static_cast=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_static_cast" = yes; then
  AC_DEFINE(HAVE_STATIC_CAST,,
            [define if the compiler supports static_cast<>])
fi
])


dnl @synopsis AC_CXX_TEMPLATES
dnl
dnl If the compiler supports basic templates, define HAVE_TEMPLATES.
dnl
dnl @author Luc Maisonobe
dnl
AC_DEFUN([AC_CXX_TEMPLATES],
[AC_CACHE_CHECK(whether the compiler supports basic templates,
ac_cv_cxx_templates,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([template<class T> class A {public:A(){}};
template<class T> void f(const A<T>& ){}],[
A<double> d; A<int> i; f(d); f(i); return 0;],
 ac_cv_cxx_templates=yes, ac_cv_cxx_templates=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_templates" = yes; then
  AC_DEFINE(HAVE_TEMPLATES,,[define if the compiler supports basic templates])
fi
rm -rf SunWS_cache
])

#
# Macro to test for pthread library
# Written by Bob Friesenhahn based on test in ACX_PTHREAD
# MAGICK_CHECK_PTHREAD_LIB(LIBRARY,
#              [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
#
AC_DEFUN([MAGICK_CHECK_PTHREAD_LIB], [
AC_REQUIRE([AC_CANONICAL_HOST])
AC_LANG_SAVE
AC_LANG_C
magick_pthread_lib_ok=no

LIB=-l$1
save_LIBS="$LIBS"
LIBS="$LIBS $LIB"

AC_MSG_CHECKING([for the pthreads library $LIB])
AC_TRY_LINK([#include <pthread.h>],
  [  pthread_t th;
  pthread_join(th, 0);
  pthread_attr_init(0);
  pthread_cleanup_push(0, 0);
  pthread_create(0,0,0,0);
  pthread_cleanup_pop(0); ],
  [magick_pthread_lib_ok=yes])

AC_MSG_RESULT(${magick_pthread_lib_ok})
if test "$magick_pthread_lib_ok" = yes
then
  $2
  :
else
  $3
  :
fi

LIBS="$save_LIBS"

AC_LANG_RESTORE
])dnl MAGICK_CHECK_PTHREAD_LIB


# GM_FUNC_MMAP_FILEIO
# ------------
AC_DEFUN([GM_FUNC_MMAP_FILEIO],
[AC_CHECK_HEADERS(stdlib.h unistd.h)
AC_CHECK_FUNCS(getpagesize)
AC_CACHE_CHECK(for working mmap file i/o, gm_cv_func_mmap_fileio,
[AC_RUN_IFELSE([AC_LANG_SOURCE([AC_INCLUDES_DEFAULT]
[[/* malloc might have been renamed as rpl_malloc. */
#undef malloc

/*
   This test is derived from GNU Autoconf's similar macro.
   The purpose of this test is to verify that files may be memory
   mapped, and that memory mapping and file I/O are coherent.

   The test creates a test file, memory maps the file, updates
   the file using the memory map, and then reads the file using
   file I/O to verify that the file contains the updates.
*/

#include <fcntl.h>
#include <sys/mman.h>

#if !STDC_HEADERS && !HAVE_STDLIB_H
char *malloc ();
#endif

/* This mess was copied from the GNU getpagesize.h.  */
#if !HAVE_GETPAGESIZE
/* Assume that all systems that can run configure have sys/param.h.  */
# if !HAVE_SYS_PARAM_H
#  define HAVE_SYS_PARAM_H 1
# endif

# ifdef _SC_PAGESIZE
#  define getpagesize() sysconf(_SC_PAGESIZE)
# else /* no _SC_PAGESIZE */
#  if HAVE_SYS_PARAM_H
#   include <sys/param.h>
#   ifdef EXEC_PAGESIZE
#    define getpagesize() EXEC_PAGESIZE
#   else /* no EXEC_PAGESIZE */
#    ifdef NBPG
#     define getpagesize() NBPG * CLSIZE
#     ifndef CLSIZE
#      define CLSIZE 1
#     endif /* no CLSIZE */
#    else /* no NBPG */
#     ifdef NBPC
#      define getpagesize() NBPC
#     else /* no NBPC */
#      ifdef PAGESIZE
#       define getpagesize() PAGESIZE
#      endif /* PAGESIZE */
#     endif /* no NBPC */
#    endif /* no NBPG */
#   endif /* no EXEC_PAGESIZE */
#  else /* no HAVE_SYS_PARAM_H */
#   define getpagesize() 8192	/* punt totally */
#  endif /* no HAVE_SYS_PARAM_H */
# endif /* no _SC_PAGESIZE */

#endif /* no HAVE_GETPAGESIZE */

int
main ()
{
  char *data, *data2, *data3;
  int i, pagesize;
  int fd;

  pagesize = getpagesize ();

  /* First, make a file with some known garbage in it. */
  data = (char *) malloc (pagesize);
  if (!data)
    exit (1);
  for (i = 0; i < pagesize; ++i)
    *(data + i) = rand ();
  umask (0);
  fd = creat ("conftest.mmap", 0600);
  if (fd < 0)
    exit (1);
  if (write (fd, data, pagesize) != pagesize)
    exit (1);
  close (fd);

  /* Mmap the file as read/write/shared and verify that we see the
  same garbage. */
  fd = open ("conftest.mmap", O_RDWR);
  if (fd < 0)
    exit (1);
  data2 = mmap (0, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0L);
  if (data2 == 0)
    exit (1);
  for (i = 0; i < pagesize; ++i)
    if (*(data + i) != *(data2 + i))
      exit (1);

  /* Finally, make sure that changes to the mapped area 
     percolate back to the file as seen by read().  */
  for (i = 0; i < pagesize; ++i)
    *(data2 + i) = *(data2 + i) + 1;
  data3 = (char *) malloc (pagesize);
  if (!data3)
    exit (1);
  if (read (fd, data3, pagesize) != pagesize)
    exit (1);
  for (i = 0; i < pagesize; ++i)
    if (*(data2 + i) != *(data3 + i))
      exit (1);
  close (fd);
  exit (0);
}]])],
	       [gm_cv_func_mmap_fileio=yes],
	       [gm_cv_func_mmap_fileio=no],
	       [gm_cv_func_mmap_fileio=no])])
if test $gm_cv_func_mmap_fileio = yes; then
  AC_DEFINE(HAVE_MMAP_FILEIO, 1,
	    [Define to 1 if you have a `mmap' system call which handles coherent file I/O.])
fi
rm -f conftest.mmap
])# GM_FUNC_MMAP_FILEIO

dnl Available from the GNU Autoconf Macro Archive at:
dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_prog_perl_version.html
dnl
AC_DEFUN([AC_PROG_PERL_VERSION],[dnl
# Make sure we have perl
if test -z "$PERL"; then
AC_CHECK_PROG(PERL,perl,perl)
fi

# Check if version of Perl is sufficient
ac_perl_version="$1"

if test "x$PERL" != "x"; then
  AC_MSG_CHECKING(for perl version greater than or equal to $ac_perl_version)
  # NB: It would be nice to log the error if there is one, but we cannot rely
  # on autoconf internals
  $PERL -e "use $ac_perl_version;" > /dev/null 2>&1
  if test $? -ne 0; then
    AC_MSG_RESULT(no);
    $3
  else
    AC_MSG_RESULT(ok);
    $2
  fi
else
  AC_MSG_WARN(could not find perl)
fi
])dnl # AC_PROG_PERL_VERSION