- Update ac_python_devel macro to integrate advice from Horst

- Improve a little GraphicalTerminalIo


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@461 3ecf2c5c-341e-0410-92b4-d18e462d057c

m4/ac_python_devel.m4

@@ -30,6 +30,7 @@ dnl @author Alan W. Irwin <irwin@beluga.phys.uvic.ca>
 dnl @author Rafael Laboissiere <laboissiere@psy.mpg.de>
 dnl @author Andrew Collier <colliera@nu.ac.za>
 dnl @author Matteo Settenvini <matteo@member.fsf.org>
+dnl @author Horst Knorr <hk_classes@knoda.org> 
 dnl @version 2006-02-05
 dnl @license GPLWithACException
 
@@ -183,4 +184,41 @@ $ac_distutils_result])
 	fi
 	AC_MSG_RESULT([$PYTHON_EXTRA_LDFLAGS])
 	AC_SUBST(PYTHON_EXTRA_LDFLAGS)
+
+	#	
+	# final check to see if everything compiles alright
+	#
+	AC_MSG_CHECKING([whether collected informations are consistent])
+	AC_LANG_PUSH([C])
+	# save current global flags
+	LIBS="$ac_save_LIBS $PYTHON_LDFLAGS"
+	CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
+	AC_TRY_LINK([
+		#include <Python.h>
+	],[
+		Py_Initialize();
+	],[pythonexists=yes],[pythonexists=no])
+
+	AC_MSG_RESULT([$pythonexists])
+
+        if test ! "$pythonexists" = "yes"; then
+	   AC_MSG_ERROR([
+  Could not link test program to Python. Maybe the main Python library has been
+  installed in some non-standard library path. If so, pass it to configure, 
+  via the LDFLAGS environment variable.
+  ============================================================================
+   ERROR!
+   You probably have to install the development version of the Python package
+   for your distribution.  The exact name of this package varies among them.
+  ============================================================================
+	   ])
+	fi
+	AC_LANG_POP
+	# turn back to default flags
+	CPPFLAGS="$ac_save_CPPFLAGS"
+	LIBS="$ac_save_LIBS"
+
+	#
+	# all done!
+	#
 ])