PostProcess.hs: modern versions of happy require alex as a build tool
PostProcess.hs: modern versions of happy require alex as a build tool

psibi/cabal2nix,dmalikov/cabal2nix,gridaphobe/cabal2nix,Fuuzetsu/cabal2nix,jb55/cabal2nix,bennofs/cabal2nix,spencerjanssen/cabal2nix