anchor.diff:      http://sagemath.org/src-old/
     ];
   
  -  # MySQL mirrors
  -  mysql = [
  -    http://mysql.mirrors.pair.com/Downloads/
  -    http://cdn.mysql.com/Downloads/
  -  ];
  -
  -  # OpenBSD mirrors
  -  openbsd = [
  -    http://openbsd.mirrors.pair.com/
  -    http://ftp.openbsd.org/pub/OpenBSD/
  +  samba = [
  +    https://samba.org/ftp/
  +  ];
  +
  +  savannah = [
  +    http://gnu.mirrors.pair.com/savannah/savannah/
  +    http://download.savannah.gnu.org/releases/
  +  ];
  +
  +  # SourceForge
  +  sourceforge = [
  +    http://prdownloads.sourceforge.net/
  +    http://heanet.dl.sourceforge.net/sourceforge/
  +    http://surfnet.dl.sourceforge.net/sourceforge/
  +    http://dfn.dl.sourceforge.net/sourceforge/
  +    http://osdn.dl.sourceforge.net/sourceforge/
  +    http://kent.dl.sourceforge.net/sourceforge/
  +  ];
  +
  +  # SourceForge.jp
  +  sourceforgejp = [
  +    http://osdn.dl.sourceforge.jp/
  +    http://jaist.dl.sourceforge.jp/
  +  ];
  +
  +  # Ubuntu
  +  ubuntu = [
  +    http://ubuntu.mirrors.pair.com/
  +    http://archive.ubuntu.com/ubuntu/
  +    http://old-releases.ubuntu.com/ubuntu/
  +  ];
  +
  +  xfce = [
  +    http://archive.xfce.org/
  +  ];
  +
  +  # X.Org
  +  xorg = [
  +    http://xorg.mirrors.pair.com/
  +    http://mirror.us.leaseweb.net/xorg/
  +    http://xorg.freedesktop.org/releases/
  +    http://ftp.x.org/pub/ # often incomplete (e.g. files missing from X.org 7.4)
     ];
   }
  
positive.code: 
    # Mirrors for mirror://site/filename URIs, where "site" is
    # "sourceforge", "gnu", etc.
  
    chromium = [
      https://commondatastorage.googleapis.com/chromium-browser-official/
      https://gsdview.appspot.com/chromium-browser-official/
    ];
  
    # SourceForge
    sourceforge = [
      http://prdownloads.sourceforge.net/
      http://heanet.dl.sourceforge.net/sourceforge/
      http://surfnet.dl.sourceforge.net/sourceforge/
      http://dfn.dl.sourceforge.net/sourceforge/
      http://osdn.dl.sourceforge.net/sourceforge/
      http://kent.dl.sourceforge.net/sourceforge/
    ];
  
    # SourceForge.jp
    sourceforgejp = [
      http://osdn.dl.sourceforge.jp/
      http://jaist.dl.sourceforge.jp/
    ];
  
    # GNU (http://www.gnu.org/prep/ftp.html).
    gnu = [
      http://mirrors.kernel.org/gnu/
      http://gnu.mirrors.pair.com/
  
      # This one redirects to a (supposedly) nearby and (supposedly) up-to-date
      # mirror.
      http://ftpmirror.gnu.org/
  
      # This one is the master repository, and thus it's always up-to-date.
      http://ftp.gnu.org/pub/gnu/
    ];
  
    # GCC
    gcc = [
      ftp://gcc.gnu.org/pub/gcc/
      ftp://ftp.nluug.nl/mirror/languages/gcc/
      ftp://ftp.fu-berlin.de/unix/languages/gcc/
    ];
  
    # GnuPG
    gnupg = [
      https://gnupg.org/ftp/gcrypt/
      ftp://ftp.gnupg.org/gcrypt/
    ];
  
    # kernel.org's /pub (/pub/{linux,software}) tree.
    kernel = [
      http://www.all.kernel.org/pub/
      http://kernel.mirrors.pair.com/
      http://mirrors.xmission.com/kernel.org/
    ];
  
    # Mirrors of ftp://ftp.kde.org/pub/kde/.
    kde = [
      http://kde.mirrors.pair.com/
      "http://download.kde.org/download.php?url="
      ftp://ftp.kde.org/pub/kde/
    ];
  
    # Gentoo
    gentoo = [
      http://mirrors.kernel.org/gentoo/
      http://gentoo.mirrors.pair.com/
      http://distfiles.gentoo.org/
    ];
  
    savannah = [
      http://gnu.mirrors.pair.com/savannah/savannah/
      http://download.savannah.gnu.org/releases/
    ];
  
    samba = [
      https://samba.org/ftp/
    ];
  
    # BitlBee mirrors, see http://www.bitlbee.org/main.php/mirrors.html
    bitlbee = [
      http://get.us.bitlbee.org/
      http://get.bitlbee.org/
    ];
  
    # ImageMagick mirrors, see http://www.imagemagick.org/script/download.php
    imagemagick = [
      http://www.imagemagick.org/download/
      ftp://ftp.sunet.se/pub/multimedia/graphics/ImageMagick/ # also contains older versions removed from most mirrors
      http://ftp.sunet.se/pub/multimedia/graphics/ImageMagick/
      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
    cpan = [
      http://mirrors.kernel.org/CPAN/
      http://cpan.pair.com/pub/CPAN
      http://cpan.perl.org/
      http://backpan.perl.org/  # for old releases
    ];
  
    # Debian
    debian = [
      http://debian.mirrors.pair.com/debian/
      http://ftp.debian.org/debian/
      ftp://ftp.debian.org/debian/
      http://archive.debian.org/debian-archive/debian/
    ];
  
    # Ubuntu
    ubuntu = [
      http://ubuntu.mirrors.pair.com/
      http://archive.ubuntu.com/ubuntu/
      http://old-releases.ubuntu.com/ubuntu/
    ];
  
    # Fedora
    fedora = [
      http://fedora.mirrors.pair.com/
      http://archives.fedoraproject.org/pub/fedora/
      http://fedora.osuosl.org/
      http://fedora.bhs.mirrors.ovh.net/
      http://mirror.csclub.uwaterloo.ca/fedora/
      http://ftp.linux.cz/pub/linux/fedora/
      http://mirror.1000mbps.com/fedora/
      http://archives.fedoraproject.org/pub/archive/fedora/
    ];
  
    # Old SUSE distributions.  Unfortunately there is no master site,
    # since SUSE actually delete their old distributions (see
    # ftp://ftp.suse.com/pub/suse/discontinued/deleted-20070817/README.txt).
    oldsuse = [
      ftp://ftp.gmd.de/ftp.suse.com-discontinued/
    ];
  
    # openSUSE
    opensuse = [
      http://opensuse.temple.edu/distribution/
      http://ftp.opensuse.org/pub/opensuse/distribution/
    ];
  
    # Gnome
    gnome = [
      # This one redirects to some mirror closeby, so it should be all you need.
      https://download.gnome.org/
    ];
  
    xfce = [
      http://archive.xfce.org/
    ];
  
    # X.Org
    xorg = [
      http://xorg.mirrors.pair.com/
      http://mirror.us.leaseweb.net/xorg/
      http://xorg.freedesktop.org/releases/
      http://ftp.x.org/pub/ # often incomplete (e.g. files missing from X.org 7.4)
    ];
  
    # Apache
    apache = [
      http://apache.mirrors.pair.com/
      http://www.apache.org/dist/
      http://archive.apache.org/dist/ # fallback for old releases
    ];
  
    postgresql = [
      http://ftp.postgresql.org/pub/
      ftp://ftp.postgresql.org/pub/
      ftp://ftp-archives.postgresql.org/pub/
    ];
  
    metalab = [
      ftp://mirrors.kernel.org/metalab/
      ftp://ftp.gwdg.de/pub/linux/metalab/
      ftp://ftp.xemacs.org/sites/metalab.unc.edu/
    ];
  
    # Bioconductor mirrors (from http://bioconductor.org/about/mirrors)
  
negative.code:     http://mirrors.ustc.edu.cn/bioc/3.2/bioc/
    ];
  
    # BitlBee mirrors, see http://www.bitlbee.org/main.php/mirrors.html
    bitlbee = [
      http://get.us.bitlbee.org/
      http://get.bitlbee.org/
    ];
  
    chromium = [
      https://commondatastorage.googleapis.com/chromium-browser-official/
      https://gsdview.appspot.com/chromium-browser-official/
    ];
  
    # CPAN
    cpan = [
      http://mirrors.kernel.org/CPAN/
      http://cpan.pair.com/pub/CPAN
      http://cpan.perl.org/
      http://backpan.perl.org/  # for old releases
    ];
  
    # CRAN mirrors (from http://cran.r-project.org/mirrors.html)
    cran = [
      http://watson.nci.nih.gov/cran_mirror/
  