{ mkDerivation, attoparsec, base, fetchurl }: mkDerivation { pname = "attoparsec-expr"; version = "0.1.1.2"; src = fetchurl { url = "http://example.org/"; sha256 = "abc"; }; libraryHaskellDepends = [ attoparsec base ]; description = "Port of parsec's expression parser to attoparsec"; license = stdenv.lib.licenses.bsd3; }