anchor.diff:  
             inkscape
   
  -          blender
  +          # blender
             librecad
           ];
         };
  
positive.code:           meld
            unstable.stack unstable.cabal-install unstable.cabal2nix
            gnumake cmake automake
  
            # myclojureenv mypythonenv myrubyenv myschemeenv myrustenv
  
            cloc
  
            gitAndTools.gitFull
            gitAndTools.tig
          ] ++ (with pkgs.unstable.haskellPackages; [
  
negative.code: { config, lib, pkgs, ... }:
  
  {
    options = {
      myconfig.roles.work = {
        enable = lib.mkEnableOption "Work role";
  