{ cabal, mtl, perl }: cabal.mkDerivation (self: { pname = "happy"; version = "1.18.10"; sha256 = "0jq6p5vvdh4wbam80q2d6j2fa6bmbgnbmqk1w9904x06g7vj1jf1"; isLibrary = false; isExecutable = true; buildDepends = [ mtl ]; buildTools = [ perl ]; meta = { homepage = "http://www.haskell.org/happy/"; description = "Happy is a parser generator for Haskell"; license = self.stdenv.lib.licenses.bsd3; platforms = self.ghc.meta.platforms; maintainers = [ self.stdenv.lib.maintainers.andres ]; }; })