[Exim] Exim-4.20 on OS X

I am attempting to build exim-4.20 on OS X. I have decided to borrow from
previous experience:

http://www.afp548.com/Articles/Jaguar/exim410.html

However, this error is getting me stuck:



bash-2.05a$ cd Builds/exim-4.20
bash-2.05a$ make
`Makefile' is up to date.

Makefile:83: *** missing separator. Stop.
make: *** [go] Error 2


What could I be missing, after editing Local/Makefile and setting
everything the way I want it???

PS: I've compiled several times on FreeBSD, but not OS X!!


TIA

-Wash

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