cmake_minimum_required(VERSION 3.1...3.14) project(DummyImport CXX) find_package(nlohmann_json REQUIRED) add_executable(with_namespace_target main.cpp) target_link_libraries(with_namespace_target nlohmann_json::nlohmann_json) add_executable(without_namespace_target main.cpp) target_link_libraries(without_namespace_target nlohmann_json)