diff -ruN -x CVS pkgsrc-2017Q2/graphics/glut/Makefile pkgsrc/graphics/glut/Makefile
--- pkgsrc-2017Q2/graphics/glut/Makefile	2015-04-25 16:23:11.000000000 +0200
+++ pkgsrc/graphics/glut/Makefile	2017-07-31 15:15:28.226634879 +0200
@@ -28,6 +28,7 @@
 
 .include "../../graphics/MesaLib/buildlink3.mk"
 .include "../../graphics/glu/buildlink3.mk"
+.include "../../security/libgcrypt/buildlink3.mk"
 .include "../../x11/libXmu/buildlink3.mk"
 .include "../../x11/libXi/buildlink3.mk"
 .include "../../mk/bsd.pkg.mk"