mesa conflict with xorg-glproto

[William Davis]

--->  Activating mesa @7.2_5+hw_render
Error: Target org.macports.activate returned: Image error: /opt/local/ 
include/GL/glxint.h is being used by the active xorg-glproto port.   
Please deactivate this port first, or use the -f flag to force the  
activation.
Error: The following dependencies failed to build: mesa
Error: Unable to upgrade port: 1

Should I use -f as this mesg indicates?

William Davis
frstanATbellsouthDOTnet
Mac OS X.5.6 Darwin 9.5.0
XQuartz 2.3.2 (xorg-server 1.4.2-apple31)
Mac Mini Intel Duo @ 1.86 GHz

Mundus vult decepi, ego non