anchor.diff:      "ftp://ftp.imagemagick.org/pub/ImageMagick/"
       "http://ftp.fifi.org/ImageMagick/"
       "ftp://ftp.fifi.org/ImageMagick/"
  -    "http://imagemagick.mirrorcatalogs.com/"
  -    "ftp://imagemagick.mirrorcatalogs.com/imagemagick"
     ];
   
     # CPAN mirrors.
  
positive.code:     "https://mirror.yandex.ru/mirrors/sage.math.washington.edu/spkg/upstream/"
  
      # Australia
      "http://echidna.maths.usyd.edu.au/sage/spkg/upstream/"
  
      # Europe
      "http://sage.mirror.garr.it/mirrors/sage/spkg/upstream/"
      "http://sunsite.rediris.es/mirror/sagemath/spkg/upstream/"
      "http://mirror.switch.ch/mirror/sagemath/spkg/upstream/"
      "http://mirrors.fe.up.pt/pub/sage/spkg/upstream/"
      "http://www-ftp.lip6.fr/pub/math/sagemath/spkg/upstream/"
  
negative.code: 
      "http://ftp.nluug.nl/pub/gnu/"
      "http://mirrors.kernel.org/gnu/"
      "http://mirror.ibcp.fr/pub/gnu/"
      "http://mirror.dogado.de/gnu/"
      "http://mirror.tochlab.net/pub/gnu/"
      "ftp://ftp.funet.fi/pub/mirrors/ftp.gnu.org/gnu/"
  
      # This one is the master repository, and thus it's always up-to-date.
  