Please update cairomm in rawhide and F15 to 1.9.2, which is needed for latest gtkmm30. Currently 1.9.2 is in F14, but in rawhide and F15 we only have cairomm 1.9.1.
cairomm-1.9.8-1.fc15 has been submitted as an update for Fedora 15. https://admin.fedoraproject.org/updates/cairomm-1.9.8-1.fc15
Thanks, requested buildroot override to fix gtkmm30 broken deps: https://fedorahosted.org/rel-eng/ticket/4436
cairomm-1.9.8-1.fc15, gtkmm30-2.99.3-3.fc15 has been pushed to the Fedora 15 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update cairomm gtkmm30'. You can provide feedback for this update here: https://admin.fedoraproject.org/updates/gtkmm30-2.99.3-3.fc15,cairomm-1.9.8-1.fc15