编译方法
mkdir jsoncpp-Sandbox ; cd jsoncpp-Sandbox
git clone https://github.com/open-source-parsers/jsoncpp.git
mkdir jsoncpp-build
mkdir jsoncpp-install
cd ./jsoncpp-build/
cmake ../jsoncpp/ -DCMAKE_INSTALL_PREFIX=/home/vis/work/SourceCode/jsoncpp-Sandbox/jsoncpp-install
make -j16
make install