I'm not sure, but vt(4) isn't necessary for TTY with Nvidia GPU's, so it would be strange to check for it. AFAIK the only thing that prevented Mesa from being updated to 9.2+ was the lack of hardware context, which made new Intel GPU's not work.Wasn't that automatically the case when vt(4) was loaded, or something to that effect?
OPTIONS_SET=GALLIUM
WITH_GALLIUM=YES
Why? All I did was update ports, with no other changes. And it's still working.
WITH_GALLIUM=YES
OPTIONS_SET=GALLIUM
portmaster -ad gave me a working Mesa 10.3.0. My make.conf also only includes the
WITH_GALLIUM=YES