99-arabic.conf

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
    <match target="pattern">
        <test name="lang" compare="contains">
            <string>ar</string>
        </test>
        <test qual="any" name="family">
            <string>sans-serif</string>
        </test>
        <edit name="family" mode="prepend" binding="strong">
            <string>Noto Sans Arabic</string>
        </edit>
    </match>
    <match target="pattern">
        <test name="lang" compare="contains">
            <string>ar</string>
        </test>
        <test qual="any" name="family">
            <string>serif</string>
        </test>
        <edit name="family" mode="prepend" binding="strong">
            <string>Noto Sans Arabic</string>
        </edit>
    </match>
    <match target="scan">
        <test name="family" compare="not_eq">
            <string>Noto Sans Arabic</string>
        </test>
        <edit name="charset" mode="assign">
            <minus>
                <name>charset</name>
                <charset>
                    <range>
                        <int>0xFDFD</int>
                        <int>0xFDFD</int>
                    </range>
                </charset>
            </minus>
        </edit>
    </match>
</fontconfig>