A portable POSIX shell CLI to the https://0x0.st file sharing and URL shortening service.
The main documentation is the man page which you can view at 0x0(1) or with man 0x0.
0x0 is written in portable shell and should run anywhere cURL is installed. You most likely already have cURL, otherwise you should install it. It's in your repositories.
make install installs the executable to $(PREFIX)/bin and the manual to $(PREFIX)/man/man1, $(PREFIX) defaulting to /usr/local. For most Unix-likes this is the correct locations. The notable exception is MacOS. It does not search /usr/local/man for manuals by default. Instead they go in /usr/share/man or /usr/local/share/man. Deal with it.