checking for GNOME_PLATFORM... yes checking for EVOLUTION_DATA_SERVER... configure: error: Package requirements (libebook-1.2 >= 2.26.3 libecal-1.2 >= 2.26.3 libedataserver-1.2 >= 2.26.3 libedataserverui-1.2 >= 2.26.3 libegroupwise-1.2 >= 2.26.3 libebackend-1.2 >= 2.26.3 libgdata-1.2 >= 2.26.3 libgdata-google-1.2 >= 2.26.3) were not met: The ebuild has a dependency on >=evolution-data-server-2.26.1, but as seen above the configuration script actually checks for >=evolution-data-server-2.26.3
gah, I got caught by automagic numbering...
Fixed into the main tree without a bump . thanks for reporting ;)