$ nix-env -iA cachix -f https://cachix.org/api/v1/install
$ cachix use ghcide-nix
Currently available for ghc8102, ghc884 and ghc865:
environment.systemPackages = [
(import (builtins.fetchTarball "https://github.com/cachix/ghcide-nix/tarball/master") {}).ghcide-ghc883
];$ nix-env -iA ghcide-ghc883 -f https://github.com/cachix/ghcide-nix/tarball/master
./update