submodules

Devs I want to build a GHC from someone else repo; this one actually git@github.com:Tritlo/ghc.gitmailto:git@github.com:Tritlo/ghc.git. But when I clone it, and then do git submodule init; git submodule update, I get lots of git submodule update Cloning into '.arc-linters/arcanist-external-json-linter'... ERROR: Repository not found. fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists. Clone of 'git@github.com:Tritlo/arcanist-external-json-linter.git' into submodule path '.arc-linters/arcanist-external-json-linter' failed simonpj@cam-05-unx:~/code/ghc-holes$ What is the kosher way to do this? Thanks Simon