最新jsoncpp源码下载地址：
https://github.com/open-source-parsers/jsoncpp
打开version文件可以看到当前版本号。目前最新版本为0.7.0
README.md 说明了如何进行编译。其中：
Generating amalgamated source and header
JsonCpp is provided with a script to generate a single header and a single source file to ease inclusion into an existing project. The amalgamated source can be generated at any time by running the following command from the top-directory (this requires Python 2.6):
python amalgamate.py
It is possible to specify header name. See the -h option for detail.
By default,the following files are generated:
dist/jsoncpp.cpp: source file that needs to be added to your project.dist/json/json.h: corresponding header file for use in your project. It is equivalent to includingjson/json.hin non-amalgamated source. This header only depends on standard headers.dist/json/json-forwards.h: header that provides forward declaration of all JsonCpp types.
The amalgamated sources are generated by concatenating JsonCpp source in the correct order and defining the macroJSON_IS_AMALGAMATION to prevent inclusion of other headers.