anchor.diff:      "https://ftp.funet.fi/pub/mirrors/ftp.kde.org/pub/kde/"
     ];
   
  -  # Gentoo files.
  -  gentoo = [
  -    "https://ftp.snt.utwente.nl/pub/os/linux/gentoo/"
  -    "https://distfiles.gentoo.org/"
  -    "https://mirrors.kernel.org/gentoo/"
  -  ];
  -
  +  # kernel.org's /pub (/pub/{linux,software}) tree
  +  kernel = [
  +    "https://cdn.kernel.org/pub/"
  +    "http://linux-kernel.uio.no/pub/"
  +    "ftp://ftp.funet.fi/pub/mirrors/ftp.kernel.org/pub/"
  +  ];
  +
  +  # Metalab, now IBiblio
  +  metalab = [
  +    "ftp://ftp.gwdg.de/pub/linux/metalab/"
  +    "ftp://ftp.metalab.unc.edu/pub/linux/"
  +  ];
  +
  +  # MySQL
  +  mysql = [
  +    "https://cdn.mysql.com/Downloads/"
  +  ];
  +
  +  # Maven Central
  +  maven = [
  +    "https://repo1.maven.org/maven2/"
  +  ];
  +
  +  # Mozilla projects
  +  mozilla = [
  +    "https://download.cdn.mozilla.net/pub/mozilla.org/"
  +    "https://archive.mozilla.org/pub/"
  +  ];
  +
  +  # OSDN (formerly SourceForge.jp)
  +  osdn = [
  +    "https://osdn.dl.osdn.jp/"
  +    "https://osdn.mirror.constant.com/"
  +    "https://mirrors.gigenet.com/OSDN/"
  +    "https://osdn.dl.sourceforge.jp/"
  +    "https://jaist.dl.sourceforge.jp/"
  +  ];
  +
  +  # PostgreSQL
  +  postgresql = [
  +    "https://ftp.postgresql.org/pub/"
  +  ];
  +
  +  # Roy marples mirrors
  +  roy = [
  +    "https://roy.marples.name/downloads/"
  +    "https://cflags.cc/roy/"
  +  ];
  +
  +  # Sage mirrors (https://www.sagemath.org/mirrors.html)
  +  sageupstream = [
  +    # Africa (HTTPS)
  +    "https://sagemath.mirror.ac.za/spkg/upstream/"
  +    "https://mirror.ufs.ac.za/sagemath/spkg/upstream/"
  +
  +    # America, North (HTTPS)
  +    "https://mirrors.mit.edu/sage/spkg/upstream/"
  +    "https://mirrors.xmission.com/sage/spkg/upstream/"
  +
  +    # Asia (HTTPS)
  +    "https://mirrors.tuna.tsinghua.edu.cn/sagemath/spkg/upstream/"
  +    "https://mirrors.ustc.edu.cn/sagemath/spkg/upstream/"
  +    "http://ftp.tsukuba.wide.ad.jp/software/sage/spkg/upstream/"
  +    "https://ftp.yz.yamagata-u.ac.jp/pub/math/sage/spkg/upstream/"
  +    "https://mirror.yandex.ru/mirrors/sage.math.washington.edu/spkg/upstream/"
  +
  +    # Australia (HTTPS)
  +    "https://mirror.aarnet.edu.au/pub/sage/spkg/upstream/"
  +
  +    # Europe (HTTPS)
  +    "https://sage.mirror.garr.it/mirrors/sage/spkg/upstream/"
  +    "https://www-ftp.lip6.fr/pub/math/sagemath/spkg/upstream/"
  +
  +    # Africa (non-HTTPS)
  +    "ftp://ftp.sun.ac.za/pub/mirrors/www.sagemath.org/spkg/upstream/"
  +
  +    # America, North (non-HTTPS)
  +    "http://www.cecm.sfu.ca/sage/spkg/upstream/"
  +
  +    # America, South (non-HTTPS)
  +    "http://sagemath.c3sl.ufpr.br/spkg/upstream/"
  +    "http://linorg.usp.br/sage/spkg/upstream"
  +
  +    # Asia (non-HTTPS)
  +    "http://ftp.kaist.ac.kr/sage/spkg/upstream/"
  +    "http://ftp.riken.jp/sagemath/spkg/upstream/"
  +
  +    # Europe (non-HTTPS)
  +    "http://mirrors.fe.up.pt/pub/sage/spkg/upstream/"
  +    "http://ftp.ntua.gr/pub/sagemath/spkg/upstream/"
  +  ];
  +
  +  # SAMBA
  +  samba = [
  +    "https://www.samba.org/ftp/"
  +    "http://www.samba.org/ftp/"
  +  ];
  +
  +  # GNU Savannah
     savannah = [
       # Mirrors from https://download-mirror.savannah.gnu.org/releases/00_MIRRORS.html
       "https://mirror.easyname.at/nongnu/"
  
positive.code: {
  
    # Content-addressable Nix mirrors.
    hashedMirrors = [
      "https://tarballs.nixos.org"
    ];
  
negative.code:     "ftp://ftp.funet.fi/pub/mirrors/ftp.debian.org/debian/"
    ];
  
    # Fedora
    # Please add only full mirrors that carry old Fedora distributions as well
    # See: https://mirrors.fedoraproject.org/publiclist (but not all carry old content)
    fedora = [
      "https://archives.fedoraproject.org/pub/fedora/"
      "https://fedora.osuosl.org/"
  