[Exim] compiling exim if user exim not exists

Hi,All!
I want to compile exim on system where user exim not exists.
Is it possible?
I've set environments variables
EXIM_USER=exim
EXIM_GROUP=exim
and these variables in Local/Makefile.
But when I've do make, I've got errors
----------------------------------------------------------
Building configuration file config.h

*** User "exim" (specified one of the Makefiles) does not exist.
    Please review your build-time configuration.

make[1]: *** [config.h] Error 1
-----------------------------------------------------------------------------------

P.S. I have no possibility create exim-user on computer where I'm compiling it
:(

Regards
Victor V Ismakaev