Missing pkg-config.

[xfbs]

I think this could use a pkg-config file?

[harkue]

json-parser is required in json-builder. It's better to add a module for find dependency via FindXXX.cmake or pkg-config.

[doug-gilbert]

I use json-builder without json-parser. It just takes a few modifications. See https://github.com/doug-gilbert/sg3_utils/tree/main/lib and the files js_json_builder.[hc] . Can't help you with cmake stuff.