AC_CHECK_HEADERS(fcntl.h limits.h stdint.h strings.h sys/fcntl.h sys/time.h sys/mnttab.h sys/statvfs.h sys/stat.h sys/vfs.h mntent.h unistd.h termios.h sys/termios.h netdb.h sgtty.h sys/mount.h statfs.h sys/types.h dlfcn.h errno.h sys/errno.h)
AC_CHECK_HEADER(sys/cdefs.h,,
AC_MSG_RESULT([enabling generic cdefs.h from tree])
AC_CHECK_HEADERS(fcntl.h limits.h stdint.h strings.h sys/fcntl.h sys/time.h sys/mnttab.h sys/statvfs.h sys/stat.h sys/vfs.h mntent.h unistd.h termios.h sys/termios.h netdb.h sgtty.h sys/mount.h statfs.h sys/types.h dlfcn.h errno.h sys/errno.h)
AC_CHECK_HEADER(sys/cdefs.h,,
AC_MSG_RESULT([enabling generic cdefs.h from tree])