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diff --git a/m4/zz60-xc-ovr.m4 b/m4/zz60-xc-ovr.m4
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+#---------------------------------------------------------------------------
+#
+# zz60-xc-ovr.m4
+#
+# Copyright (c) 2013 Daniel Stenberg <daniel@haxx.se>
+#
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+#
+#---------------------------------------------------------------------------
+
+# serial 1
+
+
+dnl The funny name of this file is intentional in order to make it
+dnl sort alphabetically after any libtool, autoconf or automake
+dnl provided .m4 macro file that might get copied into this same
+dnl subdirectory. This allows that macro (re)definitions from this
+dnl file may override those provided in other files.
+
+
+dnl Override an autoconf provided macro
+dnl -------------------------------------------------
+dnl This macro overrides the one provided by autoconf
+dnl 2.58 or newer, and provides macro definition for
+dnl autoconf 2.57 or older which lack it. This allows
+dnl using libtool 2.2 or newer, which requires that
+dnl this macro is used in configure.ac, with autoconf
+dnl 2.57 or older.
+
+m4_ifdef([AC_CONFIG_MACRO_DIR],
+[dnl
+m4_undefine([AC_CONFIG_MACRO_DIR])dnl
+])
+m4_define([AC_CONFIG_MACRO_DIR],[])
+
+
+dnl XC_OVR_ZZ60
+dnl -------------------------------------------------
+dnl Placing a call to this macro in configure.ac will
+dnl make macros in this file visible to other macros
+dnl used for same configure script, overriding those
+dnl provided elsewhere.
+
+AC_DEFUN([XC_OVR_ZZ60],
+[dnl
+AC_BEFORE([$0],[LT_INIT])dnl
+AC_BEFORE([$0],[AM_INIT_AUTOMAKE])dnl
+AC_BEFORE([$0],[AC_LIBTOOL_WIN32_DLL])dnl
+AC_BEFORE([$0],[AC_PROG_LIBTOOL])dnl
+dnl
+AC_BEFORE([$0],[AC_CONFIG_MACRO_DIR])dnl
+AC_BEFORE([$0],[AC_CONFIG_MACRO_DIRS])dnl
+])
+