I had the following error when installing the X11-xterm port for the first time on my intel macbook.
---> Archive XFree86-4.5.0_2.i386.tgz packaged
---> Archive for XFree86 4.5.0_2 packaged
---> Installing XFree86 4.5.0_2
---> Activating XFree86 4.5.0_2
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.
Warning: the following items did not execute (for XFree86): com.apple.activate
Error: The following dependencies failed to build: XFree86
Error: Status 1 encountered during processing.