From: https://bugs.freedesktop.org/show_bug.cgi?id=8882

The files swap_interval.c, indirect_util.c, indirect_texture_compression.c, indirect_program.c, 
indirect_dispatch_swap.c xserver/GL/glx make use of a Linux C header file, byteswap.h, to swap bytes in 
integers. In Mac OS X, version 10.4 at least, this functionality is put into libkern/OSByteOrder.h. So these 
files might need a block like:

	#elif defined(__APPLE__)
	#include <libkern/OSByteOrder.h>
	#define bswap_16 OSSwapInt16
	#define bswap_32 OSSwapInt32
	#define bswap_64 OSSwapInt64

after

	#ifdef __linux__
	#include <byteswap.h>
	#elif defined(__OpenBSD__)
	#include <sys/endian.h>
	#define bswap_16 __swap16
	#define bswap_32 __swap32
	#define bswap_64 __swap64

and before

	#else
	#include <sys/endian.h>
	#define bswap_16 bswap16
	#define bswap_32 bswap32
	#define bswap_64 bswap64
	#endif