--- 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