Problems activating XFree86

It builds without any troubles, but when I hit the activation step, I get: Error: Target com.apple.activate returned: Image error: /usr/X11R6/include/DPS/ColorSB.h already exists and does not belong to a registered port. Unable to activate port XFree86. Error: Status 1 encountered during processing. Any ideas on how I can get around this error? I need XFree86 installed because the gd2 port depends upon it. I'm curious...I assume that the gd2 port depends upon it because it is being built with xpm support. Would it be possible to have a variant of gd2 without xpm support and (perhaps) then be able to drop the dependency on XFree86...? Thank you.