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-rw-r--r--gl/xsize.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/gl/xsize.h b/gl/xsize.h
index 2922f35305..5675593f54 100644
--- a/gl/xsize.h
+++ b/gl/xsize.h
@@ -27,6 +27,9 @@
# include <stdint.h>
#endif
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
_GL_INLINE_HEADER_BEGIN
#ifndef XSIZE_INLINE
# define XSIZE_INLINE _GL_INLINE