Makes configure fail on missing GL headers

diff --git a/configure.ac b/configure.ac
index 120b9e75b312fd6b8e479a5c740934cfccef0eaa..ed7e0f2e1be2730198bc7b8dc4a2809bb01a1ccb 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -3594,7 +3594,7 @@ if test "${enable_glx}" != "no" &&
       VLC_ADD_PLUGINS([glx])
       VLC_ADD_LDFLAGS([glx],[${X_LIBS} ${X_PRE_LIBS} -lX11 -lXext -lGL -lGLU])
       VLC_ADD_CPPFLAGS([glx],[${X_CFLAGS}])
-   ])
+   ],[AC_MSG_ERROR([Please install GL development package. Alternatively you can also configure with --disable-glx.])])
   CPPFLAGS="${CPPFLAGS_save}"
 fi