The CMake command below downloads CGAL from github: Release CGAL-5.4.1 · CGAL/cgal · GitHub
It downloads the source files but it does not download GMP and MPFR libraries, for Windows 64bits as is seen in release structure.
Question How you would include these two compiled libraries as part of this command?
ExternalProject_Add(cgal
GIT_REPOSITORY https://github.com/CGAL/cgal.git
GIT_TAG v5.4.1
CMAKE_ARGS
-DCMAKE_INSTALL_PREFIX:PATH=${CMAKE_INSTALL_PREFIX}
)