anchor.diff:  
     enableParallelBuilding = true;
   
  -  nativeBuildInputs = [ makeWrapper ];
  -
  -  buildInputs = [ xlibsWrapper libXpm libXmu libXi libXp Xaw3d libXaw ];
  -
     meta = with lib; {
       description = "An interactive drawing tool for X11";
       longDescription = ''
  
positive.code: { lib, stdenv, fetchurl, xlibsWrapper, makeWrapper, libXpm
  , libXmu, libXi, libXp, Xaw3d, libXaw, fig2dev
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:     url = "mirror://sourceforge/mcj/xfig-${version}.tar.xz";
      sha256 = "1czamqp0xn0j6qjnasa3fjnrzi072v6qknylr6jrs4gwsfw4ybyw";
    };
  
    nativeBuildInputs = [ makeWrapper ];
  
    buildInputs = [
      xlibsWrapper
      libXpm
      libXmu
      libXi
      libXp
      Xaw3d
      libXaw
    ];
  
    postPatch = ''
      sed -i 's:"fig2dev":"${fig2dev}/bin/fig2dev":' src/main.c
  