dotfiles/.config/fontconfig/conf.avail/30-droid-noto-mono.conf

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
  <alias binding="same">
    <family>Droid Mono</family>
    <accept>
      <family>Noto Mono</family>
    </accept>
  </alias>
</fontconfig>