I can't find this anywhere.
I've installed json-spirit on my ubuntu server with apt-get install json-spirit-dev.
What linker flag has to be used with g++ to use json-spirit?
The only library listed in that package is called libjson_spirit.a. You can link with it by adding -ljson_spirit to your linker step.
来源：https://stackoverflow.com/questions/17437893/what-is-the-json-spirit-linker-flag-for-g