m4

1 
1 GNU M4
1 ******
1 
1 This manual (31 December 2016) is for GNU M4 (version 1.4.18), a package
1 containing an implementation of the m4 macro language.
1 
1    Copyright (C) 1989-1994, 2004-2014, 2016 Free Software Foundation,
1 Inc.
1 
1      Permission is granted to copy, distribute and/or modify this
1      document under the terms of the GNU Free Documentation License,
1      Version 1.3 or any later version published by the Free Software
1      Foundation; with no Invariant Sections, no Front-Cover Texts, and
1      no Back-Cover Texts.  A copy of the license is included in the
1      section entitled "GNU Free Documentation License."
1 
1    GNU 'm4' is an implementation of the traditional UNIX macro
1 processor.  It is mostly SVR4 compatible, although it has some
1 extensions (for example, handling more than 9 positional parameters to
1 macros).  'm4' also has builtin functions for including files, running
1 shell commands, doing arithmetic, etc.  Autoconf needs GNU 'm4' for
1 generating 'configure' scripts, but not for running them.
1 
1    GNU 'm4' was originally written by Rene' Seindal, with subsequent
1 changes by Franc,ois Pinard and other volunteers on the Internet.  All
1 names and email addresses can be found in the files 'm4-1.4.18/AUTHORS'
1 and 'm4-1.4.18/THANKS' from the GNU M4 distribution.
1 
1    This is release 1.4.18.  It is now considered stable: future releases
1 in the 1.4.x series are only meant to fix bugs, increase speed, or
1 improve documentation.  However...
1 
1    An experimental feature, which would improve 'm4' usefulness, allows
1 for changing the syntax for what is a "word" in 'm4'.  You should use:
1      ./configure --enable-changeword
1 if you want this feature compiled in.  The current implementation slows
1 down 'm4' considerably and is hardly acceptable.  In the future, 'm4'
1 2.0 will come with a different set of new features that provide similar
1 capabilities, but without the inefficiencies, so changeword will go away
1 and _you should not count on it_.
1 

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