​#​ Top level CMakeLists.txt​ ​project​(FOO) ... ​option​(FOO_USE_EXTERNAL_JSON ​"Use an external JSON library"​ ​OFF​) ... ​add_subdirectory​(thirdparty) ... ​add_library​(foo ...) ... ​#​ Note that the namespaced target will always be available regardless of the​ ​#​ import method​ ​target_link_libraries​(foo ​PRIVATE​ nlohmann_json::nlohmann_json)

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