[wdm] How to change fonts for wdmLogin?

[bsdfan на nurfuerspam.de]

I just upgraded from 1.27 to 1.28 (on FreeBSD 5.4). Now the fonts shown in
wdmLogin look ugly. I also updated Xorg to 6.8.2 and WindowMaker to 0.91.0,
so this might not be wdm's fault.

The question is: How do I change to fonts used in wdmLogin. Looking at the
source I found it uses WMBoldSystemFontOfSize(). I tried changing fonts in
the system's WMGLOBAL file, but it seems to have no effect.

Regards
Markus