diff --git a/api/gutil.C b/api/gutil.C
index fe0fc978e1..898eb75b48 100755
--- a/api/gutil.C
+++ b/api/gutil.C
@@ -2,18 +2,18 @@
 // Version 1.0 (the "License"); you may not use this file except in
 // compliance with the License. You may obtain a copy of the License at
 // http://boinc.berkeley.edu/license_1.0.txt
-// 
+//
 // Software distributed under the License is distributed on an "AS IS"
 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 // License for the specific language governing rights and limitations
-// under the License. 
-// 
-// The Original Code is the Berkeley Open Infrastructure for Network Computing. 
-// 
+// under the License.
+//
+// The Original Code is the Berkeley Open Infrastructure for Network Computing.
+//
 // The Initial Developer of the Original Code is the SETI@home project.
 // Portions created by the SETI@home project are Copyright (C) 2002
-// University of California at Berkeley. All Rights Reserved. 
-// 
+// University of California at Berkeley. All Rights Reserved.
+//
 // Contributor(s):
 //
 
@@ -31,6 +31,10 @@
 #include <OpenGL/gl.h>
 #include <GLUT/glut.h>
 #endif
+#ifdef unix
+#include <GL/gl.h>
+#include <GL/glu.h>
+#endif
 
 #include "gutil.h"
 GLfloat mat_diffuse[] = {0.7, 0.5, 1.0, 0.4};