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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

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)

Last update: May 1, 2022