anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "cstore_fdw";
  -  version = "1.7.0";
  +  version = "unstable-2022-03-08";
   
     nativeBuildInputs = [ protobufc ];
     buildInputs = [ postgresql ];
  
positive.code:   src = fetchFromGitHub {
      owner  = "citusdata";
      repo   = "cstore_fdw";
      rev    = "refs/tags/v${version}";
      sha256 = "129mpq8rq16jg7idh6c1j6nij64iywrs7wl3cn02bdb3h8f19z1b";
    };
  
    installPhase = ''
  
negative.code:   '';
  
    meta = with lib; {
      broken      = versionAtLeast postgresql.version "14";
      description = "Columnar storage for PostgreSQL";
      homepage    = "https://github.com/citusdata/cstore_fdw";
      maintainers = with maintainers; [ thoughtpolice ];
      platforms   = postgresql.meta.platforms;
      license     = licenses.asl20;
  