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-rw-r--r--tests/examples/gtk/glliveshader.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/tests/examples/gtk/glliveshader.c b/tests/examples/gtk/glliveshader.c
index d8c8d3506..5a71bc3fc 100644
--- a/tests/examples/gtk/glliveshader.c
+++ b/tests/examples/gtk/glliveshader.c
@@ -25,6 +25,10 @@
#include <X11/Xlib.h>
#endif
+#ifndef GL_GEOMETRY_SHADER
+#define GL_GEOMETRY_SHADER 0x8DD9
+#endif
+
static GMainLoop *loop;
static const gchar *vert = "#version 330\n\