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On BSD-compatible systems some information such as the number of available CPUs may only be available via the sysctl function. Add support for a HAVE_BSD_SYSCTL option complete with autoconf support and include the sys/syctl.h header when the option is enabled to make the sysctl function available. Signed-off-by: Kyle J. McKay <mackyle@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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