anchor.diff:  { stdenv, lib, fetchFromGitHub, makeWrapper, cmake, pkgconfig
  -, boost, cereal, curl, eigen, expat, glew, libpng, tbb, wxGTK30
  +, boost, cereal, curl, eigen, expat, glew, libpng, tbb, wxGTK31
   , gtest, nlopt, xorg, makeDesktopItem
   }:
   let
  
positive.code:     glew
      libpng
      tbb
      wxGTK30
      xorg.libX11
    ] ++ checkInputs;
  
  
negative.code: 
    cmakeFlags = [
      "-DSLIC3R_FHS=1"
    ];
  
    postInstall = ''
  