Thunderbird blocks the ebuild x11-plugins/lightning even if it does not include lightning itself, ie installed with lightning USE flag disabled. Reproducible: Always Steps to Reproduce: 1. Get any x11-plugins/lightning ebuild 2. USE="-lightning" emerge mail-client/thunderbird x11-plugins/lightning Actual Results: emerge fails with 'Blocked Packages' [blocks B ] x11-plugins/lightning ("x11-plugins/lightning" is blocking mail-client/thunderbird-3.1.9) Expected Results: x11-plugins/lightning should have been installed alongside thunderbird.
Created attachment 266305 [details, diff] fixes the bug
Afair, the current supported way is to use the bundled lightning.
Lightning is part of thunderbird build now, it will not be released as a standalone any longer. This was the best decision for gentoo for long term support.