[Mimedefang] inaddr_loopback undeclared under mimedefang 2.37

[Peng, Willie]

Greetings,
 
I've encountered errors when compiling mimdefang 2.37, I am running BSDi 4.31, anyone has ideas why?  I have no problem compiling and running mimedefang 2.33.
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utils.c: In function `make_listening_socket':
utils.c:1014: `INADDR_LOOPBACK' undeclared (first use in this function)
utils.c:1014: (Each undeclared identifier is reported only once
utils.c:1014: for each function it appears in.)
*** Error code 1
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Thanks in advance,
 
Willie