Qt5 ignores my fontconfig

This is my fonts.conf:

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>

<match target="font">
<edit name="antialias" mode="assign"> <bool>false</bool></edit>
<edit name="hinting" mode="assign"><bool>true</bool></edit>
<edit name="hintstyle" mode="assign"> <const>hintmedium</const> </edit>
<edit name="rgba" mode="assign"> <const>rgb</const> </edit>
<edit name="autohint" mode="assign"><bool>false</bool></edit>
<edit name="lcdfiler" mode="assign"><const>lcdnone</const></edit>
<edit name="dpi" mode="assign"><double>102</double></edit>
</match>

<match target="pattern">
<edit name="family" mode="assign">
<string>Arial</string>
</edit>
</match>

</fontconfig>

Qt4 works as expected. But Qt5 ignores most settings, including 'antialias', 'hinting', 'autohint' and 'dpi'.