Hello!

I had modify build process into your parser/builder - I had add (looks like a) full cmake integration:
After sudo make install library will be available for cmake's operator find_package (cjson REQUIRED) - no need write extra cmake-Finder's

Also, I am had merge two libraries (builder+parser) into one, not sure is it interesting for you.

You can check it at:
https://github.com/vaclav2016/cjson

PS: Thanks! nice library !