anchor.diff:  assert selinuxSupport -> libselinux != null && libsepol != null;
   
   stdenv.mkDerivation rec {
  -  name = "coreutils-8.20";
  +  name = "coreutils-8.21";
   
     src = fetchurl {
       url = "mirror://gnu/coreutils/${name}.tar.xz";
  -    sha256 = "1cly97xdy3v4nbbx631k43smqw0nnpn651kkprs0yyl2cj3pkjyv";
  +    sha256 = "064f512185iysqqcvhnhaf3bfmzrvcgs7n405qsyp99zmfyl9amd";
     };
   
     nativeBuildInputs = [ perl ];
  
positive.code:     ++ stdenv.lib.optional selinuxSupport libselinux
      ++ stdenv.lib.optional selinuxSupport libsepol;
  
    crossAttrs = ({
      buildInputs = [ gmp ]
        ++ stdenv.lib.optional aclSupport acl.crossDrv
        ++ stdenv.lib.optional selinuxSupport libselinux.crossDrv
  
negative.code:     maintainers = [ stdenv.lib.maintainers.ludo ];
    };
  }
  