anchor.diff:  , libelfin
   , ncurses
   , python3
  +, python3Packages
   , makeWrapper
   }:
   stdenv.mkDerivation rec {
  
positive.code:   nativeBuildInputs = [
      ncurses
      makeWrapper
    ];
  
    buildInputs = [
  
negative.code:     # fix executable includes
      chmod -x $out/include/coz.h
  
      wrapPythonPrograms
    '';
  
    meta = {
  