Examples must exist somewhere in hard drive after installation, but it's not. If examples is not installable in this package, than "examples" use-flag must be deleted for it, i think...
elmer ~ # qlist -eo dev-cpp/cairomm /usr/include/cairomm-1.0/cairomm/path.h /usr/include/cairomm-1.0/cairomm/surface.h /usr/include/cairomm-1.0/cairomm/refptr.h /usr/include/cairomm-1.0/cairomm/fontoptions.h /usr/include/cairomm-1.0/cairomm/context.h /usr/include/cairomm-1.0/cairomm/win32_surface.h /usr/include/cairomm-1.0/cairomm/fontface.h /usr/include/cairomm-1.0/cairomm/enums.h /usr/include/cairomm-1.0/cairomm/cairomm.h /usr/include/cairomm-1.0/cairomm/quartz_surface.h /usr/include/cairomm-1.0/cairomm/pattern.h /usr/include/cairomm-1.0/cairomm/exception.h /usr/include/cairomm-1.0/cairomm/xlib_surface.h /usr/include/cairomm-1.0/cairomm/scaledfont.h /usr/lib/libcairomm-1.0.a /usr/lib/debug/usr/lib/libcairomm-1.0.so.1.1.0.debug /usr/lib/libcairomm-1.0.so.1.1.0 /usr/lib/libcairomm-1.0.la /usr/lib/pkgconfig/cairomm-1.0.pc [ebuild R ] dev-cpp/cairomm-1.4.4 USE="examples -doc" 0 kB
"examples" use flag has been nuked from cairomm-1.6.0 as the Makefiles really don't allow installing examples at all (neither source nor binary). Fixed in portage without a revbump. Thanks