The sylpheed-claws-2.1.1 ebuild depends on libetpan-0.41 However, the configure script will fail saying that libetpan-0.45 is required. The COMMONDEPEND in the ebuild should be changes to require libetpan-0.45 instead of -0.41
No clue how that happened, was sure I bumped that when I added 2.1.1. Well fixed now anyway, thanks for the notification.