OF
typedef uLong (*check_func) OF((uLong check, Bytef *buf, uInt len));
# define OF(args) args
# define OF(args) ()
typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
typedef void (*free_func) OF((voidpf opaque, voidpf address, uInt nbytes));
typedef uLong (*check_func) OF((uLong check, const Bytef *buf, uInt len));
typedef block_state (*compress_func) OF((deflate_state *s, int flush));
#define OF(args) args
#define OF(args) ()
typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
typedef void (*free_func) OF((voidpf opaque, voidpf address));