The live ebuild for twittering-mode contains a patch that no longer applies. As the ebuild was committed a long while ago, upstream moved and changed the source many times. The current patch no longer applies since this commit https://github.com/hayamiz/twittering-mode/commit/0f46ae6c00edc93f29e5346d2be2fc0b6be0ff9a which was pushed a day after twittering-mode was committed to tree. Thanks
patch dropped. Thanks.