--- zlib-1.2.2/zlib.h.xx	2005-02-23 12:52:02.889385975 +0100
+++ zlib-1.2.2/zlib.h	2005-02-23 12:55:14.227599948 +0100
@@ -986,7 +986,12 @@
    (0 in case of error).
 */
 
-ZEXTERN int ZEXPORTVA   gzprintf OF((gzFile file, const char *format, ...));
+
+ZEXTERN int ZEXPORTVA   gzprintf OF((gzFile file, const char *format, ...)) 
+#ifdef __GNUC__
+	__attribute__((__format__(__printf__,2,3)))
+#endif
+;
 /*
      Converts, formats, and writes the args to the compressed file under
    control of the format string, as in fprintf. gzprintf returns the number of