{ cabal, mtl, perl }: cabal.mkDerivation (self: { pname = "happy"; version = "1.18.8"; sha256 = "1mqdawxszmdk71fbl8ljxz7jyhai00sflaw0gahp039n44mrspam"; 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 ]; }; })