I'm not sure if this a bug, but as far as I know on a stable system such packages should fit together. Currently, app-backup/borgbackup needs dev-python/msgpack-0.5.6, while dev-python/msgpack-0.6.2 is stable. As I direct consequence, portage complains about this in a normal update. Emerging a newer borgbackup seems to fix the error (as the dependency on msgpack is gone). Reproducible: Always Steps to Reproduce: 1. emerge borgbackup msgpack Actual Results: Should work. Expected Results: Conflicts.
If you are not sure, if it is a bug, please clarify via our support channels first. We can not help you efficiently via bug tracker. The bug tracker aims rather on specific problems in .ebuilds and less on individual systems. I have had very good experience on the gentoo IRC [1] with questions like this. Of course there are also forums and mailing lists [2,3]. I hope you understand, that I will close the bug here therefore and wish you good luck on one of the mentioned channels [4]. Please reopen the ticket in order to provide an indication for an specific error in an ebuild or any gentoo related product. [1] https://www.gentoo.org/get-involved/irc-channels/ [2] https://forums.gentoo.org/ [3] https://www.gentoo.org/get-involved/mailing-lists/all-lists.html [4] https://www.gentoo.org/support/