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The json.tar.xz rule packed neither src/modules nor tests, but the top-level CMakeLists.txt needs src/modules for NLOHMANN_JSON_BUILD_MODULES=ON and defaulted JSON_BuildTests to ON for a main project. A standalone configure of the extracted archive failed at add_subdirectory(tests), and enabling the module failed at add_subdirectory(src/modules). Add src/modules to the archive, and default JSON_BuildTests to ON only if tests/CMakeLists.txt exists, so a repository checkout still builds the tests by default while the archive configures out of the box. Use GNU tar via a TAR variable (gtar if present, else tar), the same way SED is found, instead of hard-coding gtar. The library, its public API, and its ABI are unchanged. Part of #5716 Signed-off-by: Niels Lohmann <mail@nlohmann.me>