anchor.diff:  
           nixpkgs.tarball
           (all allSupportedNixpkgs.emacs)
  -        (all allSupportedNixpkgs.jdk)
  +        # The currently available aarch64 JDK is unfree
  +        (except ["aarch64-linux"] allSupportedNixpkgs.jdk)
         ];
     });
   
  
positive.code:     };
      constituents =
        let
          all = x: map (system: x.${system}) supportedSystems;
        in [
          nixos.channel
          (all nixos.dummy)
  
negative.code:         nixos.tests.chromium.x86_64-linux or []
          (all nixos.tests.firefox)
          (all nixos.tests.firewall)
          (except ["aarch64-linux"] nixos.tests.gnome3)
          nixos.tests.installer.zfsroot.x86_64-linux or [] # ZFS is 64bit only
          (except ["aarch64-linux"] nixos.tests.installer.lvm)
          (except ["aarch64-linux"] nixos.tests.installer.luksroot)
          (except ["aarch64-linux"] nixos.tests.installer.separateBoot)
          (except ["aarch64-linux"] nixos.tests.installer.separateBootFat)
          (except ["aarch64-linux"] nixos.tests.installer.simple)
          (except ["aarch64-linux"] nixos.tests.installer.simpleLabels)
          (except ["aarch64-linux"] nixos.tests.installer.simpleProvided)
          (except ["aarch64-linux"] nixos.tests.installer.simpleUefiSystemdBoot)
          (except ["aarch64-linux"] nixos.tests.installer.swraid)
          (except ["aarch64-linux"] nixos.tests.installer.btrfsSimple)
          (except ["aarch64-linux"] nixos.tests.installer.btrfsSubvols)
          (except ["aarch64-linux"] nixos.tests.installer.btrfsSubvolDefault)
          (except ["aarch64-linux"] nixos.tests.boot.biosCdrom)
          #(except ["aarch64-linux"] nixos.tests.boot.biosUsb) # disabled due to issue #15690
          (except ["aarch64-linux"] nixos.tests.boot.uefiCdrom)
          (except ["aarch64-linux"] nixos.tests.boot.uefiUsb)
          (all nixos.tests.boot-stage1)
          (all nixos.tests.hibernate)
          nixos.tests.docker.x86_64-linux or []
  