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darwin requires _DARWIN_C_SOURCE to be defined for MAP_ANON, which is used by swscale to determine whether to use malloc() or mmap(). 64-bit darwin does not have an executable heap, so mmap() must be used instead of malloc(), and therefore _DARWIN_C_SOURCE must be defined. Originally committed as revision 31760 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale