- Install GHC and Cabal via GHCup.
- Install nix.
- Install GHCJS 8.10.4 via nix:
nix-env --install \
--file https://github.com/input-output-hk/haskell.nix/archive/master.tar.gz \
--attr pkgs-unstable.pkgsCross.ghcjs.buildPackages.haskell-nix.compiler.ghc8104