Merged revisions 74072 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r74072 | alexandre.vassalotti | 2009-07-17 20:31:06 -0400 (Fri, 17 Jul 2009) | 5 lines

  Add a check to ensure the correct autoconf version is used
  for generating the configure script.

  Original idea by Martin von Löwis.
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