anchor.diff:  
     thunderbolt = callPackage ../os-specific/linux/thunderbolt {};
   
  -  thunderbird-bin = callPackage ../applications/networking/mailreaders/thunderbird-bin { };
  -
  -  thunderbird-bin-68 = callPackage ../applications/networking/mailreaders/thunderbird-bin/68.nix { };
  +  thunderbird-bin-78 = callPackage ../applications/networking/mailreaders/thunderbird-bin { };
  +
  +  thunderbird-bin = callPackage ../applications/networking/mailreaders/thunderbird-bin/68.nix { };
   
     ticpp = callPackage ../development/libraries/ticpp { };
   
  
positive.code:     gtk3Support = true;
    };
  
    thunderbird-68 = callPackage ../applications/networking/mailreaders/thunderbird/68.nix {
      inherit (rustPackages_1_44) cargo rustc;
      libpng = libpng_apng;
      nss = nss_3_44;
  
negative.code: 
    thonny = callPackage ../applications/editors/thonny { };
  
    thunderbird-78 = callPackage ../applications/networking/mailreaders/thunderbird {
      inherit (rustPackages_1_44) cargo rustc;
      libpng = libpng_apng;
      icu = icu67;
  