dnl Check for python-config and substitute needed CFLAGS and LDFLAGS
dnl Usage:
dnl     AM_PYTHON_CONFIG

AC_DEFUN([AM_PYTHON_CONFIG],
[   AC_SUBST(PYTHON_CFLAGS)
    AC_SUBST(PYTHON_LIBS)

dnl We need to check for python build flags using distutils.sysconfig
dnl We cannot use python-config, as it was not available on older
dnl versions of python
    AC_PATH_PROG(PYTHON, python)
    AC_MSG_CHECKING([for working python])
    if test -x "$PYTHON"; then
        PYTHON_CFLAGS="`$PYTHON -c \"from distutils import sysconfig; \
            print('-I' + sysconfig.get_python_inc() + \
            ' -I' + sysconfig.get_python_inc(plat_specific=True) + ' ' + \
            sysconfig.get_config_var('BASECFLAGS'))\"`"
        PYTHON_LIBS="`$PYTHON -c \"from distutils import sysconfig; \
            print(' '.join(sysconfig.get_config_var('LIBS').split() + \
            sysconfig.get_config_var('SYSLIBS').split()) + \
            ' ' + sysconfig.get_config_var('BLDLIBRARY') + ' ' + \
            ' -L' + sysconfig.get_config_var('LIBDIR'))\"`"
            AC_MSG_RESULT([yes])
    else
        AC_MSG_RESULT([no])
        AC_MSG_ERROR([Please install python devel package])
    fi
])

dnl Taken from GNOME sources
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
    PYTHON_INCLUDES=-I`$PYTHON -c "from distutils import sysconfig; print(sysconfig.get_config_var('INCLUDEPY'))"`

    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"
])


dnl Checks for a couple of functions we use that may not be defined
dnl in some older python versions used e.g. on RHEL5
AC_DEFUN([AM_CHECK_PYTHON_COMPAT],
[AC_REQUIRE([AM_CHECK_PYTHON_HEADERS])
    save_CPPFLAGS="$CPPFLAGS"
    save_LIBS="$LIBS"
    CPPFLAGS="$CPPFLAGS $PYTHON_INCLUDES"
    LIBS="$LIBS $PYTHON_LIBS"

    AC_CHECK_FUNCS([PyErr_NewExceptionWithDoc])
    AC_CHECK_DECLS([PyModule_AddIntMacro, PyUnicode_FromString], [], [], [[#include <Python.h>]])

    CPPFLAGS="$save_CPPFLAGS"
    LIBS="$save_LIBS"
])