Filename: //etc/fonts///conf.d/51-local.conf

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
  <its:rules xmlns:its="http://www.w3.org/2005/11/its" version="1.0">
    <its:translateRule translate="no" selector="/fontconfig/*[not(self::description)]"/>
  </its:rules>

  <description>Load local customization file</description>
	<!-- Load local system customization file -->
	<include ignore_missing="yes">local.conf</include>
</fontconfig>

./Ninja\.