diff --git a/src/TKViewerTest/EXTERNLIB b/src/TKViewerTest/EXTERNLIB
index dc182de571..f4bc379ae5 100755
--- a/src/TKViewerTest/EXTERNLIB
+++ b/src/TKViewerTest/EXTERNLIB
@@ -24,3 +24,4 @@ CSF_TclLibs
 CSF_TclTkLibs
 CSF_user32
 CSF_gdi32
+CSF_OpenGlLibs