AC_CHECK_HEADERS linux/fs.h
AC_CHECK_HEADERS sys/ioctl.h
-AC_CHECK_FUNCS utimensat
+# On GNU/kFreeBSD utimensat is defined in GNU libc, but won't work.
+if [ -z "$OS_GNUKFREEBSD" ]; then
+ AC_CHECK_FUNCS utimensat
+fi
AC_CHECK_FUNCS utimes
AC_CHECK_FUNCS lutimes