anchor.diff:      inherit system;
     });
   
  -  iso_graphical = genAttrs [ "x86_64-linux" ] (system: makeIso {
  +  iso_graphical = forTheseSystems [ "x86_64-linux" ] (system: makeIso {
       module = ./modules/installer/cd-dvd/installation-cd-graphical-kde.nix;
       type = "graphical";
       inherit system;
  
positive.code:   # Build the initial ramdisk so Hydra can keep track of its size over time.
    initialRamdisk = buildFromConfig ({ pkgs, ... }: { }) (config: config.system.build.initialRamdisk);
  
    netboot = {
      x86_64-linux = makeNetboot {
        system = "x86_64-linux";
        modules = [
          ./modules/installer/netboot/netboot-minimal.nix
          versionModule
        ];
      };
    } // (optionalAttrs (elem "aarch64-linux" supportedSystems) {
      aarch64-linux = makeNetboot {
        system = "aarch64-linux";
        modules = [
          ./modules/installer/netboot/netboot-minimal.nix
          versionModule
        ];
      };});
  
    iso_minimal = forAllSystems (system: makeIso {
      module = ./modules/installer/cd-dvd/installation-cd-minimal.nix;
  
negative.code: 
  
    # A bootable VirtualBox virtual appliance as an OVA file (i.e. packaged OVF).
    ova = forTheseSystems [ "x86_64-linux" ] (system:
  
      with import nixpkgs { inherit system; };
  
  