pango has x11 and quartz variants, and by default turns both of them on. It sounds like you have installed the pango port with the quartz variant turned on and the x11 variant turned off, so you at one point ran sudo port install pango +quartz -x11.
pangomm has x11 and quartz variants, and by default turns on only the x11 variant. You've shown that you tried to install pangomm turning on the quartz variant. This will be added to the default variants, so that what will actually be installed is pangomm with x11 and quartz variants turned on.
Whatever variants you want to turn on for the pangomm port, the same variants must be turned on for the pango port.
So your options are to either install pango with quartz only, and disable x11 (sudo port install pangomm +quartz -x11), or reinstall pango with both the quartz and x11 variants on (sudo port install pango +quartz +x11).
