[exim] Multiple config files OpenBSD

Hey there,
I'm trying to get exim on OpenBSD working.
By default exim config in this OS is on one file.
I don't like that at all and I'd like to split into multiple files

I created a conf.d directory (like on debian-based OS) but I don't know
how to include in the main config file.

I tried .include /path/to/directory/ but it doesn't work, it works for
one file.

Regards,
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