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<sect2>
<title>Contents</title>
<para>
The M4 package contains the M4 processor
</para>
</sect2>
<sect2>
<title>Description</title>
<para>
M4 is a macro processor. It copies input to output expanding macros as it
goes. Macros are either built-in or user-defined and can take any number
of arguments. Besides just doing macro expansion m4 has built-in functions
for including named files, running UNIX commands, doing integer arithmetic,
manipulating text in various ways, recursion, etc. M4 can be used either
as a front-end to a compiler or as a macro processor in its own right.
</para>
</sect2>
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