anchor.diff:  #
   #  unshield = callPackage ../tools/archivers/unshield { };
   #
  -#  unzip = callPackage ../tools/archivers/unzip { };
  -#
  -#  unzipNLS = lowPrio (unzip.override { enableNLS = true; });
  +  unzip = callPackage ../tools/archivers/unzip { };
  +
  +  unzipNLS = lowPrio (unzip.override { enableNLS = true; });
   #
   #  uptimed = callPackage ../tools/system/uptimed { };
   #
  
positive.code: #
  #  libpgf = callPackage ../development/libraries/libpgf { };
  #
  #  libpng = callPackage ../development/libraries/libpng { };
  #  libpng_apng = libpng.override { apngSupport = true; };
  #  libpng12 = callPackage ../development/libraries/libpng/12.nix { };
  #
  #  libpaper = callPackage ../development/libraries/libpaper { };
  #
  #  libpfm = callPackage ../development/libraries/libpfm { };
  #
  
negative.code: #
  #  lesstif = callPackage ../development/libraries/lesstif { };
  #
    leveldb = callPackage ../development/libraries/leveldb { };
  #
    lmdb = callPackage ../development/libraries/lmdb { };
  #
  #  levmar = callPackage ../development/libraries/levmar { };
  #
  