Upstream-Status: Inappropriate [licensing]

The older GPLv2 m4 does not work well with newer autoconf. It causes the 
circular dependency as seen bellow.
  Removing this m4 file which was needed only forl older autoconf

| configure.ac:34: error: AC_REQUIRE: circular dependency of AC_GNU_SOURCE
| /build_disk/poky_build/build1/tmp/work/i586-poky-linux/m4-1.4.9-r0/m4-1.4.9/m4/extensions.m4:19: AC_USE_SYSTEM_EXTENSIONS is expanded from...
| ../../lib/autoconf/specific.m4:310: AC_GNU_SOURCE is expanded from...
| /build_disk/poky_build/build1/tmp/work/i586-poky-linux/m4-1.4.9-r0/m4-1.4.9/m4/gnulib-comp.m4:21: M4_EARLY is expanded from...
| configure.ac:34: the top level
| autom4te: /build_disk/poky_build/build1/tmp/sysroots/x86_64-linux/usr/bin/m4 failed with exit status: 1
| aclocal: /build_disk/poky_build/build1/tmp/sysroots/x86_64-linux/usr/bin/autom4te failed with exit status: 1
| autoreconf: aclocal failed with exit status: 1

Nitin A Kamble <nitin.a.kamble@intel.com>
2011/03/16

Index: m4-1.4.9/m4/extensions.m4
===================================================================
--- m4-1.4.9.orig/m4/extensions.m4
+++ m4-1.4.9/m4/extensions.m4
@@ -6,53 +6,10 @@
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS
-# Autoconf.  Perhaps we can remove this once we can assume Autoconf
-# 2.61 or later everywhere, but since CVS Autoconf mutates rapidly
-# enough in this area it's likely we'll need to redefine
-# AC_USE_SYSTEM_EXTENSIONS for quite some time.
-
-# AC_USE_SYSTEM_EXTENSIONS
-# ------------------------
-# Enable extensions on systems that normally disable them,
-# typically due to standards-conformance issues.
-AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
-[
-  AC_BEFORE([$0], [AC_COMPILE_IFELSE])
-  AC_BEFORE([$0], [AC_RUN_IFELSE])
-
-  AC_REQUIRE([AC_GNU_SOURCE])
-  AC_REQUIRE([AC_AIX])
-  AC_REQUIRE([AC_MINIX])
-
-  AH_VERBATIM([__EXTENSIONS__],
-[/* Enable extensions on Solaris.  */
-#ifndef __EXTENSIONS__
-# undef __EXTENSIONS__
-#endif
-#ifndef _POSIX_PTHREAD_SEMANTICS
-# undef _POSIX_PTHREAD_SEMANTICS
-#endif
-#ifndef _TANDEM_SOURCE
-# undef _TANDEM_SOURCE
-#endif])
-  AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
-    [ac_cv_safe_to_define___extensions__],
-    [AC_COMPILE_IFELSE(
-       [AC_LANG_PROGRAM([
-#	  define __EXTENSIONS__ 1
-	  AC_INCLUDES_DEFAULT])],
-       [ac_cv_safe_to_define___extensions__=yes],
-       [ac_cv_safe_to_define___extensions__=no])])
-  test $ac_cv_safe_to_define___extensions__ = yes &&
-    AC_DEFINE([__EXTENSIONS__])
-  AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
-  AC_DEFINE([_TANDEM_SOURCE])
-])
 
 # gl_USE_SYSTEM_EXTENSIONS
 # ------------------------
 # Enable extensions on systems that normally disable them,
 # typically due to standards-conformance issues.
 AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS],
-  [AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])])
+  [])