--- a/dvhlib.h
+++ b/dvhlib.h
@@ -3,7 +3,8 @@ #include "config.h"
 #ifdef HAVE_INTTYPES_H
 #include <inttypes.h>
 #else
-typedef unsigned int uint32_t;		/* A guess ...  */
+    #warning Guessing type of uint32_t
+    typedef unsigned int uint32_t;		/* A guess ...  */
 #endif
 
 #include "dvh.h"