Make sure kernel source is installed. If it is not installed, use ‘sysinstall’ command.
Copy kernel GENERIC configuration:
# cd /usr/src/sys/i386/conf/
# cp GENERIC KERNELNEW
Edit KERNELNEW configuration as your needed:
# ee KERNELNEW
And then, build the kernel:
# cd /usr/src
# make buildkernel KERNCONF=KERNELNEW
# make installkernel KERNCONF=KERNELNEW
Finish. Reboot PC.
To build modules, add this line into /etc/make.conf file:
MODULES_OVERRIDE=linux usb sound/pcm
In the other hand, to remove modules, add this line into /etc/make.conf file:
WITHOUT_MODULES=linux sound
