After noticing issues with executables built against argp-standalone 1.3, I decided to fork it and continue the effort.
This repository is the result of making a timeline with releases 1.0 to 1.3 obtained from https://www.lysator.liu.se/~nisse/misc/ of the original argp-standalone, copying files from glibc 2.33 and fixing them up for compatibility, and finally some general clean up. I commited many trivial changes from the glibc version in order to make updating easier.