GnuWin32 m4

An implementation of the traditional UNIX macro processor in that it copies its input to the output, expanding macros as it goes. Macros are either built-in or user-defined and can take any number of arguments. M4 also has built-in functions for including named files, running UNIX commands, doing integer arithmetic, manipulating text in various ways, and recursions. It can also be used as either a front-end to a compiler or as a macro processor in its own right. It is often used to generate HTML as it can give a consistent look to pages. If GNU m4 is meant to serve GNU autoconf, beware that m4 should be fully installed prior to configuring autoconf itself.