Hi Tobias, > I would like to use ghc 7.8.4 and cabal-install 1.20.x.
what Nixpkgs branch are you on? The current 'master' branch (a.k.a. 'nixos-unstable' channel) has cabal-install 1.22.x, and it builds fine: $ nix-build "<nixpkgs>" -A haskell-ng.packages.ghc784.cabal-install /nix/store/p6wh37rmnmx74qbm7rrpbr7rna95wqkz-cabal-install-1.22.3.0 Best regards, Peter _______________________________________________ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
