check_c_source_compiles("
#include <sys/types.h>
#include <sys/stat.h>
int main(int argc, char *argv[]) {
	struct stat sb;
	uid_t uid;
	if (stat(\"/tmp/foo\", &sb) != 0) { return (1); }
	return ((uid = sb.st_uid) == (uid_t)0);
}
" _MK_HAVE_SYS_STAT_H)