net-misc/telnet-bsd-1.2-r1 is already keyworded in the main tree for ~x86-linux, but it is absent from the Prefix tree. I used ecopy and I can verify that it works on both x64-macos. I also tried it on ~sparc64-solaris, but this ebuild suffers from a build failure on that platform because Solaris lacks a sys/cdefs.h header.
Keyworded ~x64-macos and whitelisted now. If you want compilation on Solaris to be fixed (preferably if you have a patch), please open a new bug for that. Thanks.