typedef uLong (*check_func) OF((uLong check, const Byte *buf, uInt len));
-voidp zcalloc OF((voidp opaque, unsigned items, unsigned size));
-void zcfree OF((voidp opaque, voidp ptr));
+static voidp zcalloc OF((voidp opaque, unsigned items, unsigned size));
+static void zcfree OF((voidp opaque, voidp ptr));
#define ZALLOC(strm, items, size) \
(*((strm)->zalloc))((strm)->opaque, (items), (size))