Improve autoconf_minversion detection.

[pspp] / ChangeLog

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+2006-07-29  Bruno Haible  <bruno@clisp.org>
+
+       * gnulib-tool (autoconf_minversion): If a --dir option is given and
+       relevant, look for configure.ac there, not in the current directory.
+       Also use a simple search for AC_PREREQ, not "autoconf --trace".
+
 2006-07-29  Bruno Haible  <bruno@clisp.org>
 
        * gnulib-tool (func_usage): Document option --no-libtool.