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Previous: <a rel="previous" accesskey="p" href="Command-line-options.html#Command-line-options">Command line options</a>,
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<h4 class="subsection">3.2.3 Environment variables</h4>
<p><a name="index-LANG-24"></a><a name="index-LILYPOND_005fDATADIR-25"></a>
<samp><span class="command">lilypond</span></samp> recognizes the following environment variables:
<dl>
<dt><code>LILYPOND_DATADIR</code><dd>This specifies a directory where locale messages and
data files will be looked up by default. The directory should contain
subdirectories called <samp><span class="file">ly/</span></samp>, <samp><span class="file">ps/</span></samp>, <samp><span class="file">tex/</span></samp>, etc.
<br><dt><code>LANG</code><dd>This selects the language for the warning messages.
<br><dt><code>LILYPOND_GC_YIELD</code><dd>With this variable the memory footprint and performance can be
adjusted. It is a percentage tunes memory management behavior. With
higher values, the program uses more memory, with smaller values, it
uses more CPU time. The default value is <code>70</code>.
</dl>
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