autoconf 2.69-1ubuntu1 (amd64 binary) in ubuntu quantal

 The standard for FSF source packages. This is only useful if you
 write your own programs or if you extensively modify other people's
 programs.
 .
 For an extensive library of additional Autoconf macros, install the
 `autoconf-archive' package.
 .
 This version of autoconf is not compatible with scripts meant for
 Autoconf 2.13 or earlier. If you need support for such scripts,
 you must also install the autoconf2.13 package.