--- PDL-2.3.2/perldl.conf.settings	Thu Jun 13 12:19:43 2002
+++ PDL-2.3.2/perldl.conf	Thu Jun 13 12:20:14 2002
@@ -45,7 +45,7 @@
 #	BADVAL_USENAN => 1,
 
 # Try to build Graphics/TriD
-	WITH_3D => undef,
+	WITH_3D => 0,
 #
 #  For Mesa 3.2
 #
@@ -63,9 +63,9 @@
 #	OPENGL_DEFINE => '',
 #
 # Let perl try to figure it out
-	OPENGL_LIBS => undef,
- 	OPENGL_INC => undef,
-	OPENGL_DEFINE => undef,
+	OPENGL_LIBS => 0,
+ 	OPENGL_INC => 0,
+	OPENGL_DEFINE => 0,
 # Whether or not to build the Karma interface module
 
         WITH_KARMA => undef,    # Leave it up to PDL to decide