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<h4 class="subsection" id="Macro-Packages-3">5.1.8 Macro Packages</h4>
<a class="index-entry-id" id="index-macro-package"></a>
<a class="index-entry-id" id="index-package_002c-macro"></a>

<p>Macro definitions can be collected into <em class="dfn">macro files</em>, <code class="code">roff</code>
input files designed to produce no output themselves but instead ease
the preparation of other <code class="code">roff</code> documents.  There is no syntactical
difference between a macro file and any other <code class="code">roff</code> document; only
its purpose distinguishes it.  When a macro file is installed at a
standard location and suitable for use by a general audience, it is
often termed a <em class="dfn">macro package</em>.<a class="footnote" id="DOCF29" href="groff.html_fot.html#FOOT29"><sup>29</sup></a>  Macro packages can be
loaded by supplying the <samp class="option">-m</samp> option to GNU <code class="command">troff</code> or a
<code class="code">groff</code> front end.  Alternatively, a document requiring a macro
package can load it with the <code class="code">mso</code> (&ldquo;macro source&rdquo;) request.
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