diff --git a/m4/xsize.m4 b/m4/xsize.m4
--- a/m4/xsize.m4
+++ /dev/null
@@ -1,13 +0,0 @@
-# xsize.m4 serial 3
-dnl Copyright (C) 2003-2004 Free Software Foundation, Inc.
-dnl This file is free software; the Free Software Foundation
-dnl gives unlimited permission to copy and/or distribute it,
-dnl with or without modifications, as long as this notice is preserved.
-
-AC_DEFUN([gl_XSIZE],
-[
- dnl Prerequisites of lib/xsize.h.
- AC_REQUIRE([gl_SIZE_MAX])
- AC_REQUIRE([AC_C_INLINE])
- AC_CHECK_HEADERS(stdint.h)
-])