The JSONCPP project is dual-licensed MIT and Public Domain.
The project can be downloaded from here: https://github.com/open-source-parsers/jsoncpp
Amalgamated source of JSONCPP for use in Myra Canyon was created using the following steps:
The JSONCPP source code embedded in Myra Canyon was last updated by Stéphane Charette on 2015-01-05.
.deb file is available for jsoncpp, I'd rather be using that than building 3rd-party libraries within Myra Canyon. Check when Ubuntu 15.04 or later comes out to see if a package is available for jsoncpp.