#include "opengl.h"
-extern int typesize(GLenum);
-extern int formatsize(GLenum);
-extern int paramsize(GLenum);
-extern int buffersize(GLenum);
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int typesize(GLenum);
+int formatsize(GLenum);
+int paramsize(GLenum);
+int buffersize(GLenum);
+
+#ifdef __cplusplus
+}
+#endif
#endif