Applications like tortoisehg depend on some ssh-askpass implementation. The executable in kde-plasma/ksshaskpass is /usr/bin/ksshaskpass though, so I believe the SSH_ASKPASS variable should be set to that value. (Maybe with an eselect?)
Thanks, this is in the overlay for testing: https://gitweb.gentoo.org/proj/kde.git/commit/?id=ddcd66e8ec682ea289964112ff8fd5021c13037d
Thanks, this is in the main tree as part of 5.4.2