{ mkDerivation, base, bytestring, fetchurl, tagged, text }:
mkDerivation {
  pname = "string-class";
  version = "0.1.6.5";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base bytestring tagged text ];
  homepage = "https://github.com/bairyn/string-class";
  description = "String class library";
  license = stdenv.lib.licenses.bsd3;
}