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-- url = "git://github.com/torch/sdl2-ffi.git" -- initial but did not work for me
uses "git://"
BUT this works for me:
url = "git+https://github.com/torch/sdl2-ffi.git"
by using "git+https://{...}"
a superfluous forking could be avoided perhaps
this link was enlightening for fixing : https://github.com/luarocks/luarocks/wiki/Rockspec-format