modular xorg build fails

[walt]

roger_mc at windstream.net wrote:
I'm having trouble building modular xorg on a new install of DragonFly 1.8.1;
modular-xorg-apps and -fonts build okay but modular-xorg-drivers fails when it tries to build modular-xorg-server.
This is a recent change.  Three patches for the configure script are
present but not being applied.  I'll try to find the cause when I
get home today.