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Versions of GCC prior to 4.8 didn't provide an implementation of __builtin_bswap16 on x86_64. Detect those versions and supply a fallback implementation. A cleaner fix would be to detect bswap16 independently of bswap32 in configure and handle them separately. See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52624 Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>