anchor.diff:      http://ftp.gnu.org/pub/gnu/
     ];
   
  -  # GnuPG
     gnupg = [
       https://gnupg.org/ftp/gcrypt/
       ftp://ftp.gnupg.org/gcrypt/
  
positive.code:   # Mirrors for mirror://site/filename URIs, where "site" is
    # "sourceforge", "gnu", etc.
  
    # Apache
    apache = [
      http://apache.mirrors.pair.com/
      http://www.apache.org/dist/
      http://archive.apache.org/dist/ # fallback for old releases
    ];
  
    # Bioconductor mirrors (from http://bioconductor.org/about/mirrors)
    # The commented-out ones don't seem to allow direct package downloads;
    # they serve error messages that result in hash mismatches instead.
    bioc = [
      # http://bioc.ism.ac.jp/3.2/bioc/
      # http://bioc.openanalytics.eu/3.2/bioc/
      # http://bioconductor.fmrp.usp.br/3.2/bioc/
      # http://mirror.aarnet.edu.au/pub/bioconductor/3.2/bioc/
      # http://watson.nci.nih.gov/bioc_mirror/3.2/bioc/
      http://bioconductor.jp/packages/3.2/bioc/
      http://bioconductor.statistik.tu-dortmund.de/packages/3.2/bioc/
      http://mirrors.ebi.ac.uk/bioconductor/packages/3.2/bioc/
  
negative.code:     http://archive.xfce.org/
    ];
  
    xorg = [
      http://xorg.mirrors.pair.com/
      http://mirror.us.leaseweb.net/xorg/
      http://xorg.freedesktop.org/releases/
      http://ftp.x.org/pub/
    ];
  }
  