anchor.diff:              boot.loader.grub.device = mkDefault "/dev/sda";
             });
         }).config.system.build.toplevel;
  +      preferLocalBuild = true;
       }
       "mkdir $out; ln -s $toplevel $out/dummy");
   
  
positive.code:             maintainers = maintainers.eelco;
            };
            ova = config.system.build.virtualBoxOVA;
          }
          ''
            mkdir -p $out/nix-support
  
negative.code:           };
            inherit iso;
            passthru = { inherit config; };
            preferLocalBuild = true;
          }
          ''
            mkdir -p $out/nix-support
  