So USE_EXPAND $Editor and use the flags to figure out what the default
editor should be. Or just set EDITOR so that when fcron builds it finds
the editor you used. You can always emerge fcron with EDITOR=nano and
then unmerge nano and claim fcron is 'broken'. I think most people
wouldn't care though.
The only problem currently is that EDITOR is set in /etc/profile (not
/etc/profile.env) so if you use sudo to emerge fcron, EDITOR will get
stripped from the environment, causing this problem. Then again I'd say
thats a sudo configuration problem, not necessarily a build problem.
I'm try it. See bug 149376 for more details.