Due to a large amount of spam we do not allow new users to create repositories, they are "external" users. If you are a new user and want to create a repository, for example for forking GHC, open a new issue on ghc/ghc using the "get-verified" issue template

Package cabal documentation

This is done for ghc, why should cabal be any different?

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information

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Package cabal documentation