anchor.diff:  
     # Debian.
     debian = [
  -    "http://httpredir.debian.org/debian/"
  +    "https://httpredir.debian.org/debian/"
       "ftp://ftp.de.debian.org/debian/"
       "ftp://ftp.fr.debian.org/debian/"
       "ftp://ftp.nl.debian.org/debian/"
       "ftp://ftp.ru.debian.org/debian/"
  -    "http://ftp.debian.org/debian/"
  +    "https://ftp.debian.org/debian/"
       "http://archive.debian.org/debian-archive/debian/"
       "ftp://ftp.funet.fi/pub/mirrors/ftp.debian.org/debian/"
     ];
   
     # Ubuntu.
     ubuntu = [
  -    "http://nl.archive.ubuntu.com/ubuntu/"
  +    "https://nl.archive.ubuntu.com/ubuntu/"
       "http://de.archive.ubuntu.com/ubuntu/"
       "http://archive.ubuntu.com/ubuntu/"
  -    "http://old-releases.ubuntu.com/ubuntu/"
  +    "https://old-releases.ubuntu.com/ubuntu/"
     ];
   
     # Fedora (please only add full mirrors that carry old Fedora distributions as well).
     # See: https://mirrors.fedoraproject.org/publiclist (but not all carry old content).
     fedora = [
  -    "http://archives.fedoraproject.org/pub/fedora/"
  -    "http://fedora.osuosl.org/"
  +    "https://archives.fedoraproject.org/pub/fedora/"
  +    "https://fedora.osuosl.org/"
       "http://ftp.nluug.nl/pub/os/Linux/distr/fedora/"
  -    "http://ftp.funet.fi/pub/mirrors/ftp.redhat.com/pub/fedora/"
  +    "https://ftp.funet.fi/pub/mirrors/ftp.redhat.com/pub/fedora/"
       "http://mirror.csclub.uwaterloo.ca/fedora/"
  -    "http://ftp.linux.cz/pub/linux/fedora/"
  +    "https://ftp.linux.cz/pub/linux/fedora/"
       "http://mirror.1000mbps.com/fedora/"
  -    "http://archives.fedoraproject.org/pub/archive/fedora/"
  +    "https://archives.fedoraproject.org/pub/archive/fedora/"
     ];
   
     # openSUSE.
     opensuse = [
  -    "http://opensuse.hro.nl/opensuse/distribution/"
  -    "http://ftp.funet.fi/pub/linux/mirrors/opensuse/distribution/"
  -    "http://ftp.opensuse.org/pub/opensuse/distribution/"
  -    "http://ftp5.gwdg.de/pub/opensuse/discontinued/distribution/"
  +    "https://opensuse.hro.nl/opensuse/distribution/"
  +    "https://ftp.funet.fi/pub/linux/mirrors/opensuse/distribution/"
  +    "https://ftp.opensuse.org/pub/opensuse/distribution/"
  +    "https://ftp5.gwdg.de/pub/opensuse/discontinued/distribution/"
       "http://ftp.hosteurope.de/mirror/ftp.opensuse.org/discontinued/"
     ];
   
     gnome = [
       # This one redirects to some mirror closeby, so it should be all you need.
  -    "http://download.gnome.org/"
  -
  -    "http://fr2.rpmfind.net/linux/gnome.org/"
  -    "http://ftp.acc.umu.se/pub/GNOME/"
  -    "http://ftp.belnet.be/mirror/ftp.gnome.org/"
  +    "https://download.gnome.org/"
  +
  +    "https://fr2.rpmfind.net/linux/gnome.org/"
  +    "https://ftp.acc.umu.se/pub/GNOME/"
  +    "https://ftp.belnet.be/mirror/ftp.gnome.org/"
       "ftp://ftp.cse.buffalo.edu/pub/Gnome/"
       "ftp://ftp.nara.wide.ad.jp/pub/X11/GNOME/"
     ];
   
     xfce = [
  -    "http://archive.xfce.org/"
  -    "http://mirror.netcologne.de/xfce/"
  +    "https://archive.xfce.org/"
  +    "https://mirror.netcologne.de/xfce/"
       "http://archive.se.xfce.org/xfce/"
  -    "http://archive.be.xfce.org/xfce/"
  +    "https://archive.be.xfce.org/xfce/"
       "http://mirror.perldude.de/archive.xfce.org/"
       "http://archive.be2.xfce.org/"
       "http://ftp.udc.es/xfce/"
  -    "http://archive.al-us.xfce.org/"
  +    "https://archive.al-us.xfce.org/"
     ];
   
     # X.org.
  
positive.code:     "https://www.apache.org/dist/"
      "https://archive.apache.org/dist/" # fallback for old releases
      "ftp://ftp.funet.fi/pub/mirrors/apache.org/"
      "http://apache.cs.uu.nl/"
      "http://apache.cs.utah.edu/"
    ];
  
    postgresql = [
      "http://ftp.postgresql.org/pub/"
    ];
  
    metalab = [
  
negative.code:     "https://download.kde.org/download.php?url="
      "https://ftp.gwdg.de/pub/linux/kde/"
      "https://mirrors.ocf.berkeley.edu/kde/"
      "https://mirrors.mit.edu/kde/"
      "https://mirrors.ustc.edu.cn/kde/"
      "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/"
    ];
  
    savannah = [
      # Mirrors from https://download-mirror.savannah.gnu.org/releases/00_MIRRORS.html
      "https://mirror.easyname.at/nongnu/"
      "http://mirror2.klaus-uwe.me/nongnu/"
      "https://savannah.c3sl.ufpr.br/"
      "https://mirror.csclub.uwaterloo.ca/nongnu/"
      "https://mirror.cedia.org.ec/nongnu/"
      "https://ftp.igh.cnrs.fr/pub/nongnu/"
      "https://mirror6.layerjet.com/nongnu"
      "https://mirror.netcologne.de/savannah/"
      "https://ftp.cc.uoc.gr/mirrors/nongnu.org/"
      "https://nongnu.uib.no/"
      "http://mirrors.fe.up.pt/pub/nongnu/"
      "https://ftp.acc.umu.se/mirror/gnu.org/savannah/"
      "http://ftp.twaren.net/Unix/NonGNU/"
      "http://savannah-nongnu-org.ip-connect.vn.ua/"
      "http://www.mirrorservice.org/sites/download.savannah.gnu.org/releases/"
  