anchor.diff:    outputs = [ "dev" "out" "lib" ];
   
     nativeBuildInputs = [ unzip cmake doxygen ];
  -  buildInputs = [ freeglut libGLU libGL zlib swig python xorg.libXi xorg.libXmu ];
  +  buildInputs = [ freeglut libGLU libGL zlib swig xorg.libXi xorg.libXmu ];
   
     buildPhase = ''
       make partio
  
positive.code:     mv $dev/include/*.h $dev/include/partio
    '';
  
    meta = with lib; {
      description = "C++ (with python bindings) library for easily reading/writing/manipulating common animation particle formats such as PDB, BGEO, PTC";
      homepage = "https://www.disneyanimation.com/technology/partio.html";
  
negative.code: { lib, stdenv, fetchFromGitHub, unzip, cmake, freeglut, libGLU, libGL, zlib, swig, doxygen, xorg }:
  
  stdenv.mkDerivation {
    pname = "partio";
  