check_c_source_compiles (
		"
		#include <stddef.h>
		#include <sys/sysctl.h>
		int main () {
		  int count;
		  size_t size = sizeof(count);
		  int mib[] = { CTL_HW, HW_NCPU };
		  sysctl(mib, 2, &count, &size, NULL, 0);
		}
		"
		HAVE_SYSCTL_HW_NCPU)