Make re-includable.

diff --git a/gbtypes.h b/gbtypes.h
index bdbc8ce5f6d55063473fa462a04c40ab2eba80f6..78ad7582d8b49dd91d0fb6ea8928c6dadd2b981c 100644 (file)
--- a/gbtypes.h
+++ b/gbtypes.h
@@ -19,6 +19,10 @@
 
  */
 
+#ifndef gb_types_h_included
+#define gb_types_h_included
+
+
 /*
  *  If this is a problem and any interesting system doesn't have the C99-ism
  *  of <stdint.h> we'll come up with something more clever that'll likely
@@ -46,3 +50,5 @@ typedef  int32_t       gbint32;
 typedef  int16_t        gbint16;
 
 #endif // defined(_MSC_VER)
+
+#endif /* gb_types_h_included */