diff --git a/headers/libs/glut/GL/glut.h b/headers/libs/glut/GL/glut.h
index e131205e70..be38791bf6 100644
--- a/headers/libs/glut/GL/glut.h
+++ b/headers/libs/glut/GL/glut.h
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */
diff --git a/src/libs/glut/glut_bitmap.c b/src/libs/glut/glut_bitmap.c
index a17e8d07f3..e136f2d8f6 100644
--- a/src/libs/glut/glut_bitmap.c
+++ b/src/libs/glut/glut_bitmap.c
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *	Mark Kilgard
  */
diff --git a/src/libs/glut/glut_bwidth.c b/src/libs/glut/glut_bwidth.c
index a72c33eab8..804ee5cebe 100644
--- a/src/libs/glut/glut_bwidth.c
+++ b/src/libs/glut/glut_bwidth.c
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */
diff --git a/src/libs/glut/glut_ext.c b/src/libs/glut/glut_ext.c
index 83704ca0ae..9a70deff47 100644
--- a/src/libs/glut/glut_ext.c
+++ b/src/libs/glut/glut_ext.c
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */
diff --git a/src/libs/glut/glut_shapes.c b/src/libs/glut/glut_shapes.c
index 5912f525d1..66d6979d03 100644
--- a/src/libs/glut/glut_shapes.c
+++ b/src/libs/glut/glut_shapes.c
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */
diff --git a/src/libs/glut/glut_stroke.c b/src/libs/glut/glut_stroke.c
index 689ccd2e2b..348f6ee61c 100644
--- a/src/libs/glut/glut_stroke.c
+++ b/src/libs/glut/glut_stroke.c
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */
diff --git a/src/libs/glut/glut_swidth.c b/src/libs/glut/glut_swidth.c
index 547aae0710..e979d7109a 100644
--- a/src/libs/glut/glut_swidth.c
+++ b/src/libs/glut/glut_swidth.c
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */
diff --git a/src/libs/glut/glut_teapot.c b/src/libs/glut/glut_teapot.c
index 366bef7be1..fd1bb691b5 100644
--- a/src/libs/glut/glut_teapot.c
+++ b/src/libs/glut/glut_teapot.c
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */
diff --git a/src/libs/glut/glut_util.c b/src/libs/glut/glut_util.c
index 1461fa845b..88e531f025 100644
--- a/src/libs/glut/glut_util.c
+++ b/src/libs/glut/glut_util.c
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */
diff --git a/src/libs/glut/glut_vidresize.c b/src/libs/glut/glut_vidresize.c
index afda7bfa23..25f4cc3ea0 100644
--- a/src/libs/glut/glut_vidresize.c
+++ b/src/libs/glut/glut_vidresize.c
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */
diff --git a/src/libs/glut/glutbitmap.h b/src/libs/glut/glutbitmap.h
index 830046f40b..f2cd07e711 100644
--- a/src/libs/glut/glutbitmap.h
+++ b/src/libs/glut/glutbitmap.h
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */
diff --git a/src/libs/glut/glutint.h b/src/libs/glut/glutint.h
index 6f3d7241ef..66e5ab5dce 100644
--- a/src/libs/glut/glutint.h
+++ b/src/libs/glut/glutint.h
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */
diff --git a/src/libs/glut/glutstroke.h b/src/libs/glut/glutstroke.h
index 12d3235f5a..370b53593a 100644
--- a/src/libs/glut/glutstroke.h
+++ b/src/libs/glut/glutstroke.h
@@ -2,6 +2,8 @@
  * Copyright 1994-1997 Mark Kilgard, All rights reserved.
  * Distributed under the terms of the MIT License.
  *
+ * GPL licensing not permitted.
+ *
  * Authors:
  *      Mark Kilgard
  */