m4

v 1.4.19 Updated: 1 year, 2 months ago

GNU macro processor

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 built-in functions for including files, running shell commands, doing arithmetic, etc. Autoconf needs GNU `m4' for generating `configure' scripts, but not for running them.

https://www.gnu.org/software/m4/

To install m4, paste this in macOS terminal after installing MacPorts

sudo port install m4

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