media-libs/speexdsp is needed instead of media-libs/speex. See https://forums.gentoo.org/viewtopic-t-1076456.html
It is likely needed in addition rather than instead of speex.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=fa30be47bcfe5c2e3c484148ac48b3ddd998d66f commit fa30be47bcfe5c2e3c484148ac48b3ddd998d66f Author: Sergey Popov <pinkbyte@gentoo.org> AuthorDate: 2018-04-23 08:20:47 +0000 Commit: Sergey Popov <pinkbyte@gentoo.org> CommitDate: 2018-04-23 08:20:47 +0000 net-p2p/retroshare: revision bump Add missing dependency on media-libs/speexdsp Closes: https://bugs.gentoo.org/646502 Package-Manager: Portage-2.3.31, Repoman-2.3.9 .../retroshare/{retroshare-0.6.3.ebuild => retroshare-0.6.3-r1.ebuild} | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)