[Exim] help for Exiscan with uvscan With NAI

Hi,

i use exim 4.24 builded on RH9, I want to use Exiscan with Uvscan for
scanning viruses.

I download exiscan-patch and put it in my exim directory

on exim directory? I do This:
path -p1 < exiscan-acl-4.24-13.patch
make makefile
make

and after few minutes, I've a message like "make[1]: no rule for making
target "demime.c" needed by "demime.o". STOP" (this is a translate of FRENCH
message so.... excuse me)

Please can You help me??

Thanks

Patrick