m4

 
 GNU M4
 ******
 
 This manual is for GNU M4 (version 1.4.18), a package containing an
 implementation of the m4 macro language.
 
    Copyright © 1989-1994, 2004-2014, 2016 Free Software Foundation, Inc.
 
      Permission is granted to copy, distribute and/or modify this
      document under the terms of the GNU Free Documentation License,
      Version 1.3 or any later version published by the Free Software
      Foundation; with no Invariant Sections, no Front-Cover Texts, and
      no Back-Cover Texts.  A copy of the license is included in the
      section entitled "GNU Free Documentation License."
 
    GNU 'm4' is an implementation of the traditional UNIX macro
 processor.  It is mostly SVR4 compatible, although it has some
 extensions (for example, handling more than 9 positional parameters to
 macros).  'm4' also has builtin functions for including files, running
 shell commands, doing arithmetic, etc.  Autoconf needs GNU 'm4' for
 generating 'configure' scripts, but not for running them.
 
    GNU 'm4' was originally written by René Seindal, with subsequent
 changes by François Pinard and other volunteers on the Internet.  All
 names and email addresses can be found in the files 'm4-1.4.18/AUTHORS'
 and 'm4-1.4.18/THANKS' from the GNU M4 distribution.
 
    This is release 1.4.18.  It is now considered stable: future releases
 in the 1.4.x series are only meant to fix bugs, increase speed, or
 improve documentation.  However...
 
    An experimental feature, which would improve 'm4' usefulness, allows
 for changing the syntax for what is a "word" in 'm4'.  You should use:
      ./configure --enable-changeword
 if you want this feature compiled in.  The current implementation slows
 down 'm4' considerably and is hardly acceptable.  In the future, 'm4'
 2.0 will come with a different set of new features that provide similar
 capabilities, but without the inefficiencies, so changeword will go away
 and _you should not count on it_.
 

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