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On PowerPC Mac OS X (10.5.8 "Leopard" with Xcode 3.1), system header /usr/include/ppc/param.h[1] pollutes the preprocessor namespace with a macro generically named MASK. This conflicts with the same-named macro in ewah/bitmap.c. We can avoid this conflict by using a more specific name. [1]: Included indirectly via: git-compat-util.h -> sys/sysctl.h -> sys/ucred.h -> sys/param.h -> machine/param.h -> ppc/param.h Signed-off-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>