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dnl Check if the C compiler accepts a certain C flag, and if so adds it to
dnl CFLAGS
AC_DEFUN([DIA_CHECK_CFLAG], [
  AC_MSG_CHECKING(if C compiler accepts $1)
  save_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS $1"
  AC_TRY_COMPILE([#include <stdio.h>], [printf("hello");],
    [AC_MSG_RESULT(yes)],dnl
    [AC_MSG_RESULT(no)
     CFLAGS="$save_CFLAGS"])
])

## ------------------------
## Python file handling
## From Andrew Dalke
## Updated by James Henstridge
## ------------------------

# AM_PATH_PYTHON([MINIMUM-VERSION])

# Adds support for distributing Python modules and packages.  To
# install modules, copy them to $(pythondir), using the python_PYTHON
# automake variable.  To install a package with the same name as the
# automake package, install to $(pkgpythondir), or use the
# pkgpython_PYTHON automake variable.

# The variables $(pyexecdir) and $(pkgpyexecdir) are provided as
# locations to install python extension modules (shared libraries).
# Another macro is required to find the appropriate flags to compile
# extension modules.

# If your package is configured with a different prefix to python,
# users will have to add the install directory to the PYTHONPATH
# environment variable, or create a .pth file (see the python
# documentation for details).

# If the MINIUMUM-VERSION argument is passed, AM_PATH_PYTHON will
# cause an error if the version of python installed on the system
# doesn't meet the requirement.  MINIMUM-VERSION should consist of
# numbers and dots only.


AC_DEFUN([AM_PATH_PYTHON],
 [
  dnl Find a version of Python.  I could check for python versions 1.4
  dnl or earlier, but the default installation locations changed from
  dnl $prefix/lib/site-python in 1.4 to $prefix/lib/python1.5/site-packages
  dnl in 1.5, and I don't want to maintain that logic.

  if test -z "$PYTHON"; then
     AC_PATH_PROGS(PYTHON, python python2.1 python2.0 python1.6 python1.5)
  fi

  dnl should we do the version check?
  ifelse([$1],[],,[
    AC_MSG_CHECKING(if Python version >= $1)
    changequote(<<, >>)dnl
    prog="
import sys, string
minver = '$1'
pyver = string.split(sys.version)[0]  # first word is version string
# split strings by '.' and convert to numeric
minver = map(string.atoi, string.split(minver, '.'))
if hasattr(sys, 'version_info'):
    pyver = sys.version_info[:3]
else:
    pyver = map(string.atoi, string.split(pyver, '.'))
# we can now do comparisons on the two lists:
if pyver >= minver:
        sys.exit(0)
else:
        sys.exit(1)"
    changequote([, ])dnl
    if $PYTHON -c "$prog" 1>&AC_FD_CC 2>&AC_FD_CC
    then
      AC_MSG_RESULT(okay)
    else
      AC_MSG_ERROR(too old)
    fi
  ])

  AC_MSG_CHECKING([local Python configuration])

  dnl Query Python for its version number.  Getting [:3] seems to be
  dnl the best way to do this; it's what "site.py" does in the standard
  dnl library.  Need to change quote character because of [:3]

  AC_SUBST(PYTHON_VERSION)
  changequote(<<, >>)dnl
  PYTHON_VERSION=`$PYTHON -c "import sys; print sys.version[:3]"`
  changequote([, ])dnl


  dnl Use the values of $prefix and $exec_prefix for the corresponding
  dnl values of PYTHON_PREFIX and PYTHON_EXEC_PREFIX.  These are made
  dnl distinct variables so they can be overridden if need be.  However,
  dnl general consensus is that you shouldn't need this ability.

  dnl FIXME: avoid getting NONE/lib/sitepackages below --hb
  if test "x$prefix" != "xNONE"; then
    AC_SUBST([PYTHON_PREFIX], [${prefix}])
  else
    AC_SUBST([PYTHON_PREFIX], [/usr])
  fi
  if test "x$exec_prefix" != "xNONE"; then
    AC_SUBST([PYTHON_EXEC_PREFIX], [${exec_prefix}])
  else
    AC_SUBST([PYTHON_EXEC_PREFIX], [/usr])
  fi
  
  dnl At times (like when building shared libraries) you may want
  dnl to know which OS platform Python thinks this is.

  AC_SUBST(PYTHON_PLATFORM)
  PYTHON_PLATFORM=`$PYTHON -c "import sys; print sys.platform"`


  dnl Set up 4 directories:

  dnl pythondir -- where to install python scripts.  This is the
  dnl   site-packages directory, not the python standard library
  dnl   directory like in previous automake betas.  This behaviour
  dnl   is more consistent with lispdir.m4 for example.
  dnl
  dnl Also, if the package prefix isn't the same as python's prefix,
  dnl then the old $(pythondir) was pretty useless.

  AC_CACHE_CHECK([for $am_display_PYTHON script directory],
    [am_cv_python_pythondir],
    [am_cv_python_pythondir=`$PYTHON -c "from distutils import sysconfig; print sysconfig.get_python_lib(0,0,prefix='$PYTHON_PREFIX')" 2>/dev/null ||
     echo "$PYTHON_PREFIX/${py_lib}/python$PYTHON_VERSION/site-packages"`])
  AC_SUBST([pythondir], [$am_cv_python_pythondir])

  dnl pkgpythondir -- $PACKAGE directory under pythondir.  Was
  dnl   PYTHON_SITE_PACKAGE in previous betas, but this naming is
  dnl   more consistent with the rest of automake.
  dnl   Maybe this should be put in python.am?

  AC_SUBST(pkgpythondir)
  pkgpythondir=\${pythondir}/$PACKAGE

  dnl pyexecdir -- directory for installing python extension modules
  dnl   (shared libraries)  Was PYTHON_SITE_EXEC in previous betas.

  AC_CACHE_CHECK([for $am_display_PYTHON extension module directory],
    [am_cv_python_pyexecdir],
    [am_cv_python_pyexecdir=`$PYTHON -c "from distutils import sysconfig; print sysconfig.get_python_lib(1,0,prefix='$PYTHON_EXEC_PREFIX')" 2>/dev/null ||
     echo "${PYTHON_EXEC_PREFIX}/${py_lib}/python${PYTHON_VERSION}/site-packages"`])
  AC_SUBST([pyexecdir], [$am_cv_python_pyexecdir])

  dnl pkgpyexecdir -- $(pyexecdir)/$(PACKAGE)
  dnl   Maybe this should be put in python.am?

  AC_SUBST(pkgpyexecdir)
  pkgpyexecdir=\${pyexecdir}/$PACKAGE

  AC_MSG_RESULT([looks good])
])

dnl AM_CHECK_PYMOD(MODNAME [,SYMBOL [,ACTION-IF-FOUND [,ACTION-IF-NOT-FOUND]]])
dnl Check if a module containing a given symbol is visible to python.
AC_DEFUN([AM_CHECK_PYMOD],
[AC_REQUIRE([AM_PATH_PYTHON])
py_mod_var=`echo $1['_']$2 | sed 'y%./+-%__p_%'`
AC_MSG_CHECKING(for ifelse([$2],[],,[$2 in ])python module $1)
AC_CACHE_VAL(py_cv_mod_$py_mod_var, [
ifelse([$2],[], [prog="
import sys
try:
        import $1
except ImportError:
        sys.exit(1)
except:
        sys.exit(0)
sys.exit(0)"], [prog="
import $1
$1.$2"])
if $PYTHON -c "$prog" 1>&AC_FD_CC 2>&AC_FD_CC
  then
    eval "py_cv_mod_$py_mod_var=yes"
  else
    eval "py_cv_mod_$py_mod_var=no"
  fi
])
py_val=`eval "echo \`echo '$py_cv_mod_'$py_mod_var\`"`
if test "x$py_val" != xno; then
  AC_MSG_RESULT(yes)
  ifelse([$3], [],, [$3
])dnl
else
  AC_MSG_RESULT(no)
  ifelse([$4], [],, [$4
])dnl
fi
])

dnl a macro to check for ability to create python extensions
dnl  AM_CHECK_PYTHON_HEADERS([ACTION-IF-POSSIBLE], [ACTION-IF-NOT-POSSIBLE])
dnl function also defines PYTHON_INCLUDES
AC_DEFUN([AM_CHECK_PYTHON_HEADERS],
[AC_REQUIRE([AM_PATH_PYTHON])
AC_MSG_CHECKING(for headers required to compile python extensions)
dnl deduce PYTHON_INCLUDES
if command -v python-config >/dev/null 2>&1; then
  PYTHON_INCLUDES="$PYTHON_INCLUDES $(python-config --includes)"
else
  py_prefix=`$PYTHON -c "import sys; print sys.prefix"`
  py_lib=`$PYTHON -c "from distutils import sysconfig; print sysconfig.get_python_lib(0,1)" | cut -d '/' -f 3`
  py_exec_prefix=`$PYTHON -c "import sys; print sys.exec_prefix"`
  PYTHON_INCLUDES="-I${py_prefix}/include/python${PYTHON_VERSION}"
  if test "$py_prefix" != "$py_exec_prefix"; then
    PYTHON_INCLUDES="$PYTHON_INCLUDES -I${py_exec_prefix}/include/python${PYTHON_VERSION}"
  fi
fi
AC_SUBST(PYTHON_INCLUDES)
dnl check if the headers exist:
save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $PYTHON_INCLUDES"
AC_TRY_CPP([#include <Python.h>],dnl
[AC_MSG_RESULT(found)
$1],dnl
[AC_MSG_RESULT(not found)
$2])
CPPFLAGS="$save_CPPFLAGS"
])

AC_DEFUN([AM_CHECK_PYTHON_LIB],
[AC_REQUIRE([AM_PATH_PYTHON])
AC_REQUIRE([AM_CHECK_PYTHON_HEADERS])

if command -v python-config >/dev/null 2>&1; then
  PYTHON_LIBS=$(python-config --ldflags)
else
  AC_MSG_CHECKING(for libpython${PYTHON_VERSION}.a)
  
  py_config_dir="$py_prefix/$py_lib/python${PYTHON_VERSION}/config"
  
  py_makefile="${py_config_dir}/Makefile"
  if test -f "$py_makefile"; then
  dnl extra required libs
    py_basemodlibs=`sed -n -e 's/^BASEMODLIBS=\(.*\)/\1/p' $py_makefile`
    py_other_libs=`sed -n -e 's/^LIBS=\(.*\)/\1/p' $py_makefile`
  
  dnl now the actual libpython
    if test -e "$PYTHON_PREFIX/${py_lib}/libpython${PYTHON_VERSION}.so"; then
      PYTHON_LIBS="-L${py_config_dir} -lpython${PYTHON_VERSION} $py_basemodlibs $py_other_libs"
      AC_MSG_RESULT(found)
    elif test -e "${py_prefix}/${py_lib}/libpython${PYTHON_VERSION}.a"; then
      dnl Same as above, but looking into the previous location: bug #581533
      PYTHON_LIBS="-L${py_config_dir} -lpython${PYTHON_VERSION} $py_basemodlibs $py_other_libs"
      AC_MSG_RESULT(found)
    else
      AC_MSG_RESULT(not found lib)
    fi
  else
    AC_MSG_RESULT(not found config)
  fi
fi
AC_SUBST(PYTHON_LIBS)])

# We need this because freetype is optional
# Configure paths for FreeType2
# Marcelo Magallon 2001-10-26, based on gtk.m4 by Owen Taylor

dnl AC_CHECK_FT2([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl Test for FreeType2, and define FT2_CFLAGS and FT2_LIBS
dnl
AC_DEFUN([AC_CHECK_FT2],
[dnl
dnl Get the cflags and libraries from the freetype-config script
dnl
AC_ARG_WITH(ft-prefix,
[  --with-ft-prefix=PREFIX
                          Prefix where FreeType is installed (optional)],
            ft_config_prefix="$withval", ft_config_prefix="")
AC_ARG_WITH(ft-exec-prefix,
[  --with-ft-exec-prefix=PREFIX
                          Exec prefix where FreeType is installed (optional)],
            ft_config_exec_prefix="$withval", ft_config_exec_prefix="")
AC_ARG_ENABLE(freetypetest,
[  --disable-freetypetest  Do not try to compile and run
                          a test FreeType program],
              [], enable_fttest=yes)

if test x$ft_config_exec_prefix != x ; then
  ft_config_args="$ft_config_args --exec-prefix=$ft_config_exec_prefix"
  if test x${FT2_CONFIG+set} != xset ; then
    FT2_CONFIG=$ft_config_exec_prefix/bin/freetype-config
  fi
fi
if test x$ft_config_prefix != x ; then
  ft_config_args="$ft_config_args --prefix=$ft_config_prefix"
  if test x${FT2_CONFIG+set} != xset ; then
    FT2_CONFIG=$ft_config_prefix/bin/freetype-config
  fi
fi
AC_PATH_PROG(FT2_CONFIG, freetype-config, no)

min_ft_version=ifelse([$1], ,6.1.0,$1)
AC_MSG_CHECKING(for FreeType - version >= $min_ft_version)
no_ft=""
if test "$FT2_CONFIG" = "no" ; then
  no_ft=yes
else
  FT2_CFLAGS=`$FT2_CONFIG $ft_config_args --cflags`
  FT2_LIBS=`$FT2_CONFIG $ft_config_args --libs`
  ft_config_major_version=`$FT2_CONFIG $ft_config_args --version | \
         sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
  ft_config_minor_version=`$FT2_CONFIG $ft_config_args --version | \
         sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
  ft_config_micro_version=`$FT2_CONFIG $ft_config_args --version | \
         sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
  ft_min_major_version=`echo $min_ft_version | \
         sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
  ft_min_minor_version=`echo $min_ft_version | \
         sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
  ft_min_micro_version=`echo $min_ft_version | \
         sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
  if test x$enable_fttest = xyes ; then
    ft_config_is_lt=""
    if test $ft_config_major_version -lt $ft_min_major_version ; then
      ft_config_is_lt=yes
    else
      if test $ft_config_major_version -eq $ft_min_major_version ; then
        if test $ft_config_minor_version -lt $ft_min_minor_version ; then
          ft_config_is_lt=yes
        else
          if test $ft_config_minor_version -eq $ft_min_minor_version ; then
            if test $ft_config_micro_version -lt $ft_min_micro_version ; then
              ft_config_is_lt=yes
            fi
          fi
        fi
      fi
    fi
    if test x$ft_config_is_lt = xyes ; then
      no_ft=yes
    else
      ac_save_CFLAGS="$CFLAGS"
      ac_save_LIBS="$LIBS"
      CFLAGS="$CFLAGS $FT2_CFLAGS"
      LIBS="$FT2_LIBS $LIBS"
dnl
dnl Sanity checks for the results of freetype-config to some extent
dnl
      AC_TRY_RUN([
#include <ft2build.h>
#include FT_FREETYPE_H
#include <stdio.h>
#include <stdlib.h>

int
main()
{
  FT_Library library;
  FT_Error error;

  error = FT_Init_FreeType(&library);

  if (error)
    return 1;
  else
  {
    FT_Done_FreeType(library);
    return 0;
  }
}
],, no_ft=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
      CFLAGS="$ac_save_CFLAGS"
      LIBS="$ac_save_LIBS"
    fi             # test $ft_config_version -lt $ft_min_version
  fi               # test x$enable_fttest = xyes
fi                 # test "$FT2_CONFIG" = "no"
if test x$no_ft = x ; then
   AC_MSG_RESULT(yes)
   ifelse([$2], , :, [$2])
else
   AC_MSG_RESULT(no)
   if test "$FT2_CONFIG" = "no" ; then
     echo "*** The freetype-config script installed by FreeType 2 could not be found."
     echo "*** If FreeType 2 was installed in PREFIX, make sure PREFIX/bin is in"
     echo "*** your path, or set the FT2_CONFIG environment variable to the"
     echo "*** full path to freetype-config."
   else
     if test x$ft_config_is_lt = xyes ; then
       echo "*** Your installed version of the FreeType 2 library is too old."
       echo "*** If you have different versions of FreeType 2, make sure that"
       echo "*** correct values for --with-ft-prefix or --with-ft-exec-prefix"
       echo "*** are used, or set the FT2_CONFIG environment variable to the"
       echo "*** full path to freetype-config."
     else
       echo "*** The FreeType test program failed to run.  If your system uses"
       echo "*** shared libraries and they are installed outside the normal"
       echo "*** system library path, make sure the variable LD_LIBRARY_PATH"
       echo "*** (or whatever is appropiate for your system) is correctly set."
     fi
   fi
   FT2_CFLAGS=""
   FT2_LIBS=""
   ifelse([$3], , :, [$3])
fi
AC_SUBST(FT2_CFLAGS)
AC_SUBST(FT2_LIBS)
])


##### http://autoconf-archive.cryp.to/ac_pkg_swig.html
#
# SYNOPSIS
#
#   AC_PROG_SWIG([major.minor.micro])
#
# DESCRIPTION
#
#   This macro searches for a SWIG installation on your system. If
#   found you should call SWIG via $(SWIG). You can use the optional
#   first argument to check if the version of the available SWIG is
#   greater than or equal to the value of the argument. It should have
#   the format: N[.N[.N]] (N is a number between 0 and 999. Only the
#   first N is mandatory.)
#
#   If the version argument is given (e.g. 1.3.17), AC_PROG_SWIG checks
#   that the swig package is this version number or higher.
#
#   In configure.in, use as:
#
#     AC_PROG_SWIG(1.3.17)
#     SWIG_ENABLE_CXX
#     SWIG_MULTI_MODULE_SUPPORT
#     SWIG_PYTHON
#
# LAST MODIFICATION
#
#   2006-10-22
#
# COPYLEFT
#
#   Copyright (c) 2006 Sebastian Huber <sebastian-huber@web.de>
#   Copyright (c) 2006 Alan W. Irwin <irwin@beluga.phys.uvic.ca>
#   Copyright (c) 2006 Rafael Laboissiere <rafael@laboissiere.net>
#   Copyright (c) 2006 Andrew Collier <colliera@ukzn.ac.za>
#
#   This program is free software; you can redistribute it and/or
#   modify it under the terms of the GNU General Public License as
#   published by the Free Software Foundation; either version 2 of the
#   License, or (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
#   General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
#   02111-1307, USA.
#
#   As a special exception, the respective Autoconf Macro's copyright
#   owner gives unlimited permission to copy, distribute and modify the
#   configure scripts that are the output of Autoconf when processing
#   the Macro. You need not follow the terms of the GNU General Public
#   License when using or distributing such scripts, even though
#   portions of the text of the Macro appear in them. The GNU General
#   Public License (GPL) does govern all other use of the material that
#   constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the
#   Autoconf Macro released by the Autoconf Macro Archive. When you
#   make and distribute a modified version of the Autoconf Macro, you
#   may extend this special exception to the GPL to apply to your
#   modified version as well.

AC_DEFUN([SWIG_VERSION_GOOD],[
	AC_MSG_NOTICE([SWIG executable is '$SWIG'])
        SWIG_LIB=`$SWIG -swiglib`
        AC_MSG_NOTICE([SWIG library directory is '$SWIG_LIB'])
        SWIG_VERSION=`echo $(( $available_major * 100 * 100 + $available_minor * 100 + $available_patch ))`
        AC_MSG_NOTICE([SWIG version is '$SWIG_VERSION'])
        # AM_CONDITIONAL(SWIG_NEW_OPTIONS, test "$SWIG_VERSION" \> 10331)
])

AC_DEFUN([SWIG_VERSION_BAD],[
	AC_MSG_WARN([SWIG version >= $1 is required.  You have $swig_version.  You should look at http://www.swig.org])
        SWIG='echo "Error: SWIG version >= $1 is required.  You have '"$swig_version"'.  You should look at http://www.swig.org" ; false'
])

AC_DEFUN([AC_PROG_SWIG],[
        AC_PATH_PROG([SWIG],[swig])
        if test -z "$SWIG" ; then
                AC_MSG_WARN([cannot find 'swig' program. You should look at http://www.swig.org])
                SWIG='echo "Error: SWIG is not installed. You should look at http://www.swig.org" ; false'
        elif test -n "$1" ; then
                AC_MSG_CHECKING([for SWIG version])
                [swig_version=`$SWIG -version 2>&1 | grep 'SWIG Version' | sed 's/.*\([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*/\1/g'`]
                AC_MSG_RESULT([$swig_version])
                if test -n "$swig_version" ; then
                        # Calculate the required version number components
                        [required=$1]
                        [required_major=`echo $required | sed 's/[^0-9].*//'`]
                        if test -z "$required_major" ; then
                                [required_major=0]
                        fi
                        [required=`echo $required | sed 's/[0-9]*[^0-9]//'`]
                        [required_minor=`echo $required | sed 's/[^0-9].*//'`]
                        if test -z "$required_minor" ; then
                                [required_minor=0]
                        fi
                        [required=`echo $required | sed 's/[0-9]*[^0-9]//'`]
                        [required_patch=`echo $required | sed 's/[^0-9].*//'`]
                        if test -z "$required_patch" ; then
                                [required_patch=0]
                        fi
                        # Calculate the available version number components
                        [available=$swig_version]
                        [available_major=`echo $available | sed 's/[^0-9].*//'`]
                        if test -z "$available_major" ; then
                                [available_major=0]
                        fi
                        [available=`echo $available | sed 's/[0-9]*[^0-9]//'`]
                        [available_minor=`echo $available | sed 's/[^0-9].*//'`]
                        if test -z "$available_minor" ; then
                                [available_minor=0]
                        fi
                        [available=`echo $available | sed 's/[0-9]*[^0-9]//'`]
                        [available_patch=`echo $available | sed 's/[^0-9].*//'`]
                        if test -z "$available_patch" ; then
                                [available_patch=0]
                        fi


 
			if test $available_major -gt $required_major; then  
				# the available major is greater than  required major --GOOD
				SWIG_VERSION_GOOD()	
                         
			elif test $available_major -lt $required_major ; then  
				# the avialable major is less than required major -- BAD
				SWIG_VERSION_BAD()
			else  
				# the available and require major are equal check the minor and patch versions.
				
				if test $available_minor -gt $required_minor ; then 
					# GOOD
					SWIG_VERSION_GOOD()
				elif test $avaialble_minor -lt $required_minor ; then  
					# BAD
					SWIG_VERSION_BAD()
				else  
					# the minor version are also equal

					if test $available_patch -gt $required_patch ; then   
						# GOOD						
					 	SWIG_VERSION_GOOD()
					elif test $available_minor -lt $required_minor ; then 
						# BAD
						SWIG_VERSION_BAD()
					else 
						# all the available major, minor and patch levels are the same as the required -- GOOD
						SWIG_VERSION_GOOD()
					fi
				fi
			fi	
	
	
                               

                else
                        AC_MSG_WARN([cannot determine SWIG version])
                        SWIG='echo "Error: Cannot determine SWIG version.  You should look at http://www.swig.org" ; false'
                fi
        fi
        AC_SUBST([SWIG_LIB])
])