in sylpheed ebuild file is checked for gpg to use gpg and in sylpheed-claws ebuild file is checked for gpgme to support the same feature. I think some kind of keyword list of all keywords must be done. Shouldn't be that you switch from sylpheed to sylpheed-claws and have to use different keywords for same features. I think there are more of this in other ebuilds...
The sylpheed ebuild predates the sylpheed-claws ebuild by quite some time and the use of 'gpgme' as a keyword doesn't make as much sense as the more generic 'gpg'. The sylpheed-claws package should be changed to match.
Since gpg is a sensible global USE variable, I'm deciding to use it here as well.
