Index: gpac-1.0.0/src/utils/gzio.c
===================================================================
--- gpac-1.0.0.orig/src/utils/gzio.c
+++ gpac-1.0.0/src/utils/gzio.c
@@ -93,10 +93,10 @@ typedef struct gz_stream {
 //local gzFile gz_open      OF((const char *path, const char *mode, int  fd));
 //local int do_flush        OF((gzFile file, int flush));
 //local int    get_byte     OF((gz_stream *s));
-local void   check_header OF((gz_stream *s));
-local int    destroy      OF((gz_stream *s));
+local void   check_header _Z_OF((gz_stream *s));
+local int    destroy      _Z_OF((gz_stream *s));
 //local void   putLong      OF((FILE *file, uLong x));
-local uLong  getLong      OF((gz_stream *s));
+local uLong  getLong      _Z_OF((gz_stream *s));
 
 /* ===========================================================================
      Opens a gzip (.gz) file for reading or writing. The mode parameter
Index: gpac-1.0.0/src/utils/zutil.h
===================================================================
--- gpac-1.0.0.orig/src/utils/zutil.h
+++ gpac-1.0.0/src/utils/zutil.h
@@ -262,8 +262,8 @@ extern void z_error    OF((char *m));
 #endif
 
 
-voidpf zcalloc OF((voidpf opaque, unsigned items, unsigned size));
-void   zcfree  OF((voidpf opaque, voidpf ptr));
+voidpf zcalloc _Z_OF((voidpf opaque, unsigned items, unsigned size));
+void   zcfree  _Z_OF((voidpf opaque, voidpf ptr));
 
 #define ZALLOC(strm, items, size) \
            (*((strm)->zalloc))((strm)->opaque, (items), (size))