anchor.diff:      inherit system;
     });
   
  -  iso_graphical = forAllSystems (system: makeIso {
  +  iso_graphical = genAttrs [ "x86_64-linux" ] (system: makeIso {
       module = ./modules/installer/cd-dvd/installation-cd-graphical-kde.nix;
       type = "graphical";
       inherit system;
  
positive.code: 
  
    # A bootable VirtualBox virtual appliance as an OVA file (i.e. packaged OVF).
    ova = forAllSystems (system:
  
      with import nixpkgs { inherit system; };
  
  
negative.code: 
    # A variant with a more recent (but possibly less stable) kernel
    # that might support more hardware.
    iso_minimal_new_kernel = genAttrs [ "x86_64-linux" ] (system: makeIso {
      module = ./modules/installer/cd-dvd/installation-cd-minimal-new-kernel.nix;
      type = "minimal-new-kernel";
      inherit system;
  