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    <p><code>configure</code> does not decide this: <code>make</code> does. If the <code>configure</code> script is older than <code>configure.ac</code> or any of the files it includes (starting with <code>aclocal.m4</code>), then <code>make</code> runs <code>autoconf</code> to rebuild <code>configure</code>.</p> <p>Similar rules exist to rebuild <code>aclocal.m4</code> using <code>aclocal</code>, and the various <code>Makefile.in</code> using <code>automake</code>.</p> <p>These rebuild rules should never be triggered after you unpack a tarball on a target machine, because the timestamp of all these files in the tarball should be correct (<code>configure</code> newer than <code>configure.ac</code>, etc.). So if this happens, either something is bogus in your tarball (like you did not use <code>make dist</code> or preferably <code>make distcheck</code> to generate it), or the user compiling the source code did something wrong (like copying the entire directory without preserving the timestamps), or there is something bogus in the target system (e.g. <code>make</code> usually fail to work properly on a NFS-mounted directory if the clock of the NFS-server is not synchronized with that of the client).</p> <p>Another frequent source of unwelcome rebuilt is observed by people who keep the generated files in version-control system. See <a href="http://sourceware.org/automake/automake.html#CVS" rel="noreferrer">http://sourceware.org/automake/automake.html#CVS</a> for a discussion about this if that is your case.</p>
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