Pkg-config¶

If you are using bare Makefiles, you can use pkg-config to generate the include flags that point to where the library is installed:

pkg-config nlohmann_json --cflags

A pkg-config file is installed by CMake (when the JSON_Install option is enabled, which is the default for a top-level build) as well as by several package managers.

Users of the Meson build system will also be able to use a system-wide library, which will be found by pkg-config:

json = dependency('nlohmann_json', required: true)