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<h5 class="subsubsection">6.3.2.1 Scripts Used by <samp><span class="file">configure</span></samp></h5>
<p><samp><span class="file">configure</span></samp> uses some other scripts to help in its work:
<ul>
<li>The standard GNU <samp><span class="file">config.sub</span></samp> and <samp><span class="file">config.guess</span></samp>
files, kept in the top level directory, are used.
<li>The file <samp><span class="file">config.gcc</span></samp> is used to handle configuration
specific to the particular target machine. The file
<samp><span class="file">config.build</span></samp> is used to handle configuration specific to the
particular build machine. The file <samp><span class="file">config.host</span></samp> is used to handle
configuration specific to the particular host machine. (In general,
these should only be used for features that cannot reasonably be tested in
Autoconf feature tests.)
See <a href="System-Config.html#System-Config">The <samp><span class="file">config.build</span></samp>; <samp><span class="file">config.host</span></samp>; and <samp><span class="file">config.gcc</span></samp> Files</a>, for details of the contents of these files.
<li>Each language subdirectory has a file
<samp><var>language</var><span class="file">/config-lang.in</span></samp> that is used for
front-end-specific configuration. See <a href="Front-End-Config.html#Front-End-Config">The Front End <samp><span class="file">config-lang.in</span></samp> File</a>, for details of this file.
<li>A helper script <samp><span class="file">configure.frag</span></samp> is used as part of
creating the output of <samp><span class="file">configure</span></samp>.
</ul>
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