linux-libertine-fonts/linux-libertine-fonts-biolinum-fontconfig.conf

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE fontconfig SYSTEM "../fonts.dtd">
<fontconfig>
  <match target="scan">
    <test name="family" ignore-blanks="yes">
      <string>Linux Biolinum Keyboard O</string>
    </test>
    <edit name="family" mode="assign">
      <string>Linux Biolinum Keyboard</string>
    </edit>
  </match>
  <match target="scan">
    <test name="family" ignore-blanks="yes">
      <string>Linux Biolinum O</string>
    </test>
    <edit name="family" mode="assign">
      <string>Linux Biolinum</string>
    </edit>
  </match>
  <!-- Font substitution -->
  <alias binding="same">
    <family>Linux Biolinum Keyboard O</family>
    <accept>
      <family>Linux Biolinum Keyboard</family>
    </accept>
  </alias>
  <alias binding="same">
    <family>Linux Biolinum Keyboard G</family>
    <accept>
      <family>Linux Biolinum Keyboard</family>
    </accept>
  </alias>
  <alias binding="same">
    <family>Linux Biolinum O</family>
    <accept>
      <family>Linux Biolinum</family>
    </accept>
  </alias>
  <alias binding="same">
    <family>Linux Biolinum G</family>
    <accept>
      <family>Linux Biolinum</family>
    </accept>
  </alias>
  <!-- Generic names -->
  <alias>
    <family>Linux Biolinum</family>
    <default>
      <family>sans-serif</family>
    </default>
  </alias>
</fontconfig>