[Exim] Problem Compiling 4.12

I have just downloaded Exim-4.12 and compiling using the same Local/Makefile
as version
I used for version 4.11 (which compiled fine).

Whilst running make I experienced the following:

gcc -c -O -I.    exim.c
exim.c: In function `main':
exim.c:2269: parse error before `void'
make[1]: *** [exim.o] Error 1
make[1]: Leaving directory
`/usr/common/src/mail/exim/exim-4.12/build-Linux-i386

Does anyone know what this means, or how to resolve it.

Cheers

Ed St Pierre