if(PROJECT_ENABLE_JSON)
  if(PROJECT_BUILD)
    find_package(nlohmann_json ${JSON_VERSION} REQUIRED)

    add_definitions(-DPROJECT_ENABLE_JSON)

    if(PROJECT_IS_MINGW AND PROJECT_IS_MINGW_UNIX)
      include_directories(BEFORE SYSTEM
        /mingw64/include/nlohmann
      )
    else()
      include_directories(BEFORE SYSTEM
        ${PROJECT_EXTERNAL_BUILD_ROOT}/include/nlohmann
      )
    endif()
  elseif(NOT PROJECT_IS_MINGW OR CMAKE_HOST_WIN32)
    ExternalProject_Add(json_project
      PREFIX external
      URL ${PROJECT_3RD_PARTY_DIR}/json-${JSON_VERSION}.tar.gz
      URL_HASH SHA256=0d8ef5af7f9794e3263480193c491549b2ba6cc74bb018906202ada498a79406
      LIST_SEPARATOR |
      CMAKE_ARGS ${PROJECT_EXTERNAL_CMAKE_FLAGS}
        -DBUILD_SHARED_LIBS=${PROJECT_BUILD_SHARED_LIBS}
        -DBUILD_STATIC_LIBS=ON
        -DJSON_BuildTests=OFF
        -DJSON_Install=ON
        -DJSON_MultipleHeaders=OFF
    )

    set(PROJECT_DEPENDENCIES 
      ${PROJECT_DEPENDENCIES}
      json_project
    )
  endif()
endif()