Why clone in make process？

[cfz1998]

ExternalProject_Add(
NetworKit
CMAKE_ARGS
"-DNETWORKIT_STATIC=ON"
"-DCMAKE_CXX_FLAGS='-include stdexcept'"
"-DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}/NetworKit"
GIT_REPOSITORY https://github.com/networkit/networkit.git
GIT_SHALLOW 1
GIT_PROGRESS 1
GIT_TAG ${NETWORKIT_VERSION}
UPDATE_DISCONNECTED ON
)

[bschiffthaler]

That is how ExternalProject works with CMake so you can depend on someone elses coded which is not necessarily distributed through other means. Feel free to PR a better solution