Unable to build lang/mono (mcs)

[Clint Olsen]

I'm on 6.4-STABLE and I've been unable to build this port for some time.  I
end up having to type ^C to interrupt the portupgrade process and then I
see this:

gmake[6]: Entering directory `/usr/ports/lang/mono/work/mono-2.0.1/mcs'
*** The compiler 'false' doesn't appear to be usable.
*** Trying the 'monolite' directory.
gmake[7]: Entering directory `/usr/ports/lang/mono/work/mono-2.0.1/mcs'
...

Does anyone know what this is about?

-Clint