Switching to ccache v4?

[Ken Hornstein]

>Why not change the default ccach version then? I remember hearing that
>there was a problem with that, but I can't remember what that was...

It breaks under OS X (you get "Invalid credential cache version" when you
try to kinit).  I'm not sure why; I just noticed it and I haven't had
time to investigate it.  And unfortunately everything that uses ccapi
doesn't support time offsets :-(

--Ken