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