https://gitlab.com/freedesktop-sdk/freedesktop-sdk/blob/master/files/fontconfig-flatpak.conf

     from the Freedesktop runtimes. -->

<fontconfig>

        <cachedir>/usr/cache/fontconfig</cachedir>

        <dir>/app/share/fonts</dir>

        <cachedir>/app/cache/fontconfig</cachedir>

        <include ignore_missing="yes">/app/etc/fonts/local.conf</include>

        <dir>/run/host/fonts</dir>

        <dir>/run/host/user-fonts</dir>

             before the /run dirs, in case they are ever writable, like e.g with old

             versions of flatpak. -->

        <cachedir prefix="xdg">fontconfig</cachedir>

        <cachedir>/run/host/fonts-cache</cachedir>

        <cachedir>/run/host/user-fonts-cache</cachedir>

</fontconfig>