anchor.diff:       a set of RPM packages. */
       
     fillDiskWithRPMs =
  -    {size ? 4096, rpms, name, fullName, preInstall ? "", postInstall ? "", runScripts ? true}:
  +    { size ? 4096, rpms, name, fullName, preInstall ? "", postInstall ? ""
  +    , runScripts ? true
  +    }:
       
       runInLinuxVM (stdenv.mkDerivation {
         inherit name preInstall postInstall rpms;
  
positive.code:       name = "fedora-7-i386";
        fullName = "Fedora 7 (i386)";
        packagesList = fetchurl {
          url = mirror://fedora/linux/releases/7/Fedora/i386/os/repodata/primary.xml.gz;
          sha256 = "0zq7ifirj45wry7b2qkm12qhzzazal3hn610h5kwbrfr2xavs882";
        };
        urlPrefix = mirror://fedora/linux/releases/7/Fedora/i386/os;
        packages = commonFedoraPackages;
      };
      
  
negative.code:       name = "fedora-13-i386";
        fullName = "Fedora 13 (i386)";
        packagesList = fetchurl {
          url = mirror://fedora/linux/releases/13/Everything/i386/os/repodata/be70ac9e1031fd34222b2ec6cc8a337bc6fabd1d06969990955c5f358d138e35-primary.xml.gz;
          sha256 = "be70ac9e1031fd34222b2ec6cc8a337bc6fabd1d06969990955c5f358d138e35";
        };
        urlPrefix = mirror://fedora/linux/releases/13/Everything/i386/os;
        archs = ["noarch" "i386" "i586" "i686"];
        packages = commonFedoraPackages ++ [ "cronie" "util-linux-ng" ];
      };
  