Please don't insult OpenBSD by comparing with linux. ;)
Have you ever seen the source code of OpenBSD kernel?
Have you considered how the kernel build system is organized?
Have you seen the linux kernel source?
What do you mean by "practically nothing would be good"?
And oh by the way OpenBSD is not a kernel, it is an operating system and
many people still dunno the difference between the two.
You have the choice of putting "practically nothing" by choosing only
those distributions you want in the install stage.
Another thing you could do is take a look at crunchgen(1).
# cd /usr/src/distrib/crunch
# make
# make install
man crunchgen
It is only because linux kernel is so "modular" (laugh) that people want to
build their own kernel. And to tell you honestly I still dunno how to
compile and install a linux kernel. And it varies between distros to
make things worse.
And it is easier to compile an OpenBSD kernel than to compile a linux
userland app.
Please don't retrofit OpenBSD to fit into the linux mould. It is
unfortunate that such garbage like linux is so popular.
I guess people do not read the kernel source.
But the world always had more fools than smart people...
