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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)