Standalone version of arguments parsing functions from GLIBC
It is standalone version of argp - part of glibc library. It was separated off glibc by Niels Myller. Niels primary use it for inclusion in the LSH distribution, but it's useful for any package that wants to use argp and at the same time be portable to non-glibc systems. Besides portability fixes, there are a few other changes in this version. The most important is that it no longer builds upon getopt; the one or two hairy functions of GNU getopt are incorporated with the argp parser. There are no longer any global variables keeping track of the parser state.
To install argp-standalone, paste this in macOS terminal after installing MacPorts
sudo port install argp-standalone