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+include(`setup.m4')
+
+\set_author([René Seindal])
+\set_title([What is GNU m4])
+
+\divert(1)
+
+\p([GNU \tt(m4) is an implementation of the traditional Unix macro
+processor.  GNU m4 is mostly compatible with the System V, Release 3
+version, and SVR4, although it has some extensions (for example,
+handling more than 9 positional parameters to macros). GNU \tt(m4)
+also has built-in functions for including files, running shell
+commands, doing arithmetic, etc.])
+
+\p([GNU \tt(m4) is a macro processor, in the sense that it copies its
+input to the output, expanding macros as it goes. Macros are either
+builtin or user-defined, and can take any number of arguments. Besides
+just doing macro expansion, m4 has builtin 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.])
+
+\p([The m4 macro processor is widely available on all UNIXes. Usually,
+only a small percentage of users are aware of its existence. However,
+those who do often become commited users. The growing popularity of GNU
+Autoconf, which prerequires GNU m4 for generating the `configure'
+scripts, is an incentive for many to install it, while these people will
+not themselves program in m4.])
+
+\p([Some people found m4 to be fairly addictive. They first use m4 for
+simple problems, then take bigger and bigger challenges, learning how to
+write complex m4 sets of macros along the way. Once really addicted,
+users pursue writing of sophisticated m4 applications even to solve
+simple problems, devoting more time debugging their m4 scripts than
+doing real work. Beware that m4 may be dangerous for the health of
+compulsive programmers.])
+
+\p([Autoconf needs GNU m4 for generating `configure' scripts, but not for
+running them.])
+
+\p([GNU m4 is a Unix program.  It is designed to work in a Unix-like
+environment.  GNU m4 1.4 has, however, been ported to DJGPP, the GNU C
+compiler for DOS/Windows.  These files are present in the
+\link(download.htm, download area).])
+
+\divert(0)\dnl
+\DO_LAYOUT([\undivert(1)])
+\divert(-1)