I attempted to install system-wide with sudo make install and it fails on the last line, which looks like a simple filename change:
install -c -m 0644 man/man1/json.bash.1 /usr/local/share/man/man1/
install: cannot stat ‘man/man1/json.bash.1’: No such file or directory
Makefile:27: recipe for target 'install' failed
make: *** [install] Error 1
so either the Makefile should be changed to reflect the manpage name, or change the manpage name back to 'json.bash.1'. Does 'man json' conflict with any other JSON libraries in other languages?