## this one is commonly used with AM_PATH_PYTHONDIR ...
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
py_prefix=`$PYTHON -c "import sys; print sys.prefix"`
py_exec_prefix=`$PYTHON -c "import sys; print sys.exec_prefix"`
if $PYTHON-config --help 2>/dev/null; then
  PYTHON_INCLUDES=`$PYTHON-config --includes 2>/dev/null`
else
  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"
])

dnl a macro to check for ability to embed python
dnl  AM_CHECK_PYTHON_LIBS([ACTION-IF-POSSIBLE], [ACTION-IF-NOT-POSSIBLE])
dnl function also defines PYTHON_LIBS
AC_DEFUN([AM_CHECK_PYTHON_LIBS],
[AC_REQUIRE([AM_CHECK_PYTHON_HEADERS])
AC_MSG_CHECKING(for libraries required to embed python)
dnl deduce PYTHON_LIBS
py_exec_prefix=`$PYTHON -c "import sys; print sys.exec_prefix"`
PYTHON_LIBS="-L${py_prefix}/lib -lpython${PYTHON_VERSION}"
PYTHON_LIB_LOC="${py_prefix}/lib" 
AC_SUBST(PYTHON_LIBS)
AC_SUBST(PYTHON_LIB_LOC)
dnl check if the headers exist:
save_LIBS="$LIBS"
LIBS="$LIBS $PYTHON_LIBS"
AC_TRY_LINK_FUNC(Py_Initialize, dnl
         [LIBS="$save_LIBS"; AC_MSG_RESULT(yes); $1], dnl
         [LIBS="$save_LIBS"; AC_MSG_RESULT(no); $2])

])


dnl as-ac-expand.m4 0.2.0
dnl autostars m4 macro for expanding directories using configure's prefix
dnl thomas@apestaart.org
dnl

dnl AS_AC_EXPAND(VAR, CONFIGURE_VAR)
dnl example
dnl AS_AC_EXPAND(SYSCONFDIR, $sysconfdir)
dnl will set SYSCONFDIR to /usr/local/etc if prefix=/usr/local

AC_DEFUN([AS_AC_EXPAND],
[
    EXP_VAR=[$1]
    FROM_VAR=[$2]

    dnl first expand prefix and exec_prefix if necessary
    prefix_save=$prefix
    exec_prefix_save=$exec_prefix

    dnl if no prefix given, then use /usr/local, the default prefix
    if test "x$prefix" = "xNONE"; then
        prefix="$ac_default_prefix"
    fi
    dnl if no exec_prefix given, then use prefix
    if test "x$exec_prefix" = "xNONE"; then
        exec_prefix=$prefix
    fi

    full_var="$FROM_VAR"
    dnl loop until it doesn't change anymore
    while true; do
        new_full_var="`eval echo $full_var`"
        if test "x$new_full_var" = "x$full_var"; then break; fi
        full_var=$new_full_var
    done

    dnl clean up
    full_var=$new_full_var
    AC_SUBST([$1], "$full_var")

    dnl restore prefix and exec_prefix
    prefix=$prefix_save
    exec_prefix=$exec_prefix_save
])