The net-misc/openssh package has a use flag "pie". I believe this is redundant and obsolete. The flag adds compile flags to enable position independent executables, however Gentoo's gcc package does that by default. I did a quick check and a compile of openssh with and without the flag produce exactly identical executables. I think it can be removed.
This may be related, but I cannot build openssh with USE=static and USE=-pie Removing the pie flag may also fix this.