--- a/src/pui/puGLUT.h~	2008-03-10 21:06:23.000000000 -0500
+++ b/src/pui/puGLUT.h	2019-09-23 09:09:10.755049440 -0500
@@ -36,7 +36,7 @@
 # ifdef FREEGLUT_IS_PRESENT /* for FreeGLUT like PLIB 1.6.1*/
 #  include <GL/freeglut.h>
 # else
-#  include <GL/glut.h>
+#  include <GL/freeglut.h>
 # endif
 #endif