Work around Python misdetection and set `PYTHON_LIBS' to
"-L/nix/store/... -lpython2.4" instead of "/nix/store/.../libpython2.4.so".
Changed to 2.5.

--- inkscape-0.45.1/configure	2007-03-20 14:56:43.000000000 +0100
+++ inkscape-0.45.1/configure	2008-02-22 16:19:10.000000000 +0100
@@ -10202,7 +10202,7 @@ if test "x$with_python" = "xyes"; then
     if test "$?" -gt "0"; then
         with_python="no"
     else
-        checkPYTHON_LIBS=`python -c "import distutils.sysconfig ; print '%s/%s %s' % (distutils.sysconfig.get_config_var('LIBPL'),distutils.sysconfig.get_config_var('LDLIBRARY'),distutils.sysconfig.get_config_var('LIBS'))" 2>/dev/null`
+        checkPYTHON_LIBS=`python -c "import distutils.sysconfig ; print '-L%s -lpython2.5 %s' % (distutils.sysconfig.get_config_var('LIBDIR'),distutils.sysconfig.get_config_var('LIBS'))" 2>/dev/null`
         if test "$?" -gt "0"; then
             with_python="no"
         else
