Вы про сглаживание? Во всех современных дистрибутивах freetype собирается с поддержкой субпиксельного сглаживания. Вам остается только добавить в /etc/font/conf.d/ следующие файлы:
1) 10-antialias.conf:<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!-- Use the Antialiasing -->
<match target="font">
<edit name="antialias" mode="assign"><bool>true</bool></edit>
</match>
</fontconfig>
2) 10-hinting.conf:
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!-- Use Hinting -->
<match target="font">
<edit name="hinting" mode="assign"><bool>true</bool></edit>
</match>
</fontconfig>
3) 10-hinting-slight.conf:
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!-- Use Slight Hinting -->
<match target="font">
<edit name="hintstyle" mode="assign"><const>hintslight</const></edit>
</match>
</fontconfig>
4) 10-sub-pixel-rgb.conf:
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!-- Enable sub-pixel rendering -->
<match target="pattern">
<!--
This configuration is available on the major desktop environments.
We shouldn't overwrite it with "assign" unconditionally.
Most clients may picks up the first value only. so using "append"
may simply works to avoid it.
-->
<edit name="rgba" mode="append"><const>rgb</const></edit>
</match>
</fontconfig>
5) 11-lcdfilter-default.conf
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<!-- Use lcddefault as default for LCD filter -->
<match target="pattern">
<!--
This configuration is available on the major desktop environments.
We shouldn't overwrite it with "assign" unconditionally.
Most clients may picks up the first value only. so using "append"
may simply works to avoid it.
-->
<edit mode="append" name="lcdfilter">
<const>lcddefault</const>
</edit>
</match>
</fontconfig>
