setting variants on the fly

Is it possible? What I would like to do is be able to test either that a dependency was installed with a certain variant or that a file exists and then set a variant on the port being installed based on that information. Background: I am reworking the gtk2 port so that it can be installed without X11. What I want to be able to do is have "sudo port install gtk2" work correctly, installing gtk2 with the correct variants for the machine its being installed on without user intervention or complaint. Randall Wood rhwood@mac.com http://shyramblings.blogspot.com "The rules are simple: The ball is round. The game lasts 90 minutes. All the rest is just philosophy."