{ mkDerivation, base, containers, fetchurl, tree-fun }:
mkDerivation {
  pname = "clumpiness";
  version = "0.17.0.0";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  libraryHaskellDepends = [ base containers tree-fun ];
  description = "Calculate the clumpiness of leaf properties in a tree";
  license = stdenv.lib.licenses.gpl3;
}