AC_HEADER_STAT # sys/stat.h
AC_HEADER_STDBOOL # stdbool.h
AC_HEADER_STDC # stdlib.h string.h (implied: errno.h limits.h stdio.h)
-AC_TYPE_MODE_T
# Check for header files not covered by the predefined macros above.
AC_CHECK_HEADERS([ fcntl.h ftw.h getopt.h libgen.h limits.h linux/xattr.h ])