GNU m4 is the GNU version of the m4 macro preprocessor. It is designed to avoid many kinds of limits found in traditional m4s: limits like maximum line lengths, maximum size of a macro, number of macros, etc.
The GNU Autoconf package makes extensive use of the features of GNU m4.
GNU m4 is currently maintained (albeit intermittently) by René Seindal.
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... of authority.
The first to have the title of "Tyrant" was Pisistratus in 560 BC.
In modern times Tyrant has come to mean a dictator who rules with ...