anchor.diff:      repo = "Slic3r";
       sha256 = "046ircwc0wr586v7106ys557ypslmyq9p4qgi34ads1d6bgxhlyy";
       rev = "version_${version}";
  +  };
  +
  +  desktopItem = makeDesktopItem {
  +    name = "slic3r-Prusa-Edition";
  +    exec = "slic3r-prusa3d";
  +    icon = "slic3r-prusa";
  +    comment = "G-code generator for 3D printers";
  +    desktopName = "Slic3r Prusa Edition";
  +    genericName = "3D printer tool";
  +    categories = "Application;Development;";
     };
   
     meta = with stdenv.lib; {
  
positive.code:     mkdir -p $out/bin/var
      cp -r ../resources/icons/* $out/bin/var/
      cp -r ../resources $out/bin/
    '';
  
    src = fetchFromGitHub {
  
negative.code: { stdenv, lib, fetchFromGitHub, makeWrapper, which, cmake, perl, perlPackages,
    boost, tbb, wxGTK30, pkgconfig, gtk3, fetchurl, gtk2, libGLU,
    glew, eigen, curl, gtest, nlopt, pcre, xorg, makeDesktopItem }:
  let
    AlienWxWidgets = perlPackages.buildPerlPackage rec {
      name = "Alien-wxWidgets-0.69";
  