anchor.diff:  
   let
     commonTargetPkgs = pkgs: with pkgs;
  -    let
  -      tzdir = "${pkgs.tzdata}/share/zoneinfo";
  -      # I'm not sure if this is the best way to add things like this
  -      # to an FHSUserEnv
  -      etc-zoneinfo = pkgs.runCommand "zoneinfo" {} ''
  -        mkdir -p $out/etc
  -        ln -s ${tzdir} $out/etc/zoneinfo
  -        ln -s ${tzdir}/UTC $out/etc/localtime
  -      '';
  -    in [
  +    [
         steamPackages.steam-fonts
         # Errors in output without those
         pciutils
  
positive.code:       perl
        # Open URLs
        xdg_utils
        # Zoneinfo
        etc-zoneinfo
        iana-etc
      ] ++ lib.optional withJava jdk
        ++ lib.optional withPrimus primus
  
negative.code: 
    profile = ''
      export STEAM_RUNTIME=/steamrt
    '';
  
    runScript = writeScript "steam-wrapper.sh" ''
  