upstream-layers/meta-openembedded/meta-oe/recipes-graphics/ttf-fonts/source-code-pro-fonts/44-source-code-pro-fonts-fontconfig.conf

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
  <alias>
    <family>monospace</family>
    <prefer>
      <family>Source Code Pro</family>
    </prefer>
  </alias>
  <alias>
    <family>Source Code Pro</family>
    <default>
      <family>monospace</family>
    </default>
  </alias>
</fontconfig>