Editing Compiling a new GhostBSD kernel

Install Subversion application.

 sudo pkg install FreeBSD-svn-12.0.s20180802153734

Fetch the latest kernel support files.

 sudo svn checkout svn://svn.freebsd.org/base/releng/12.0 /usr/src

Copy the generic kernel configuration to a new file, and add a link.
 
 sudo cp /usr/src/sys/amd64/conf/GENERIC  /root/GHOSTBSD
 cd /usr/src/sys/amd64/conf
 sudo ln -s /root/GHOSTBSD .

Edit the GHOSTBSD kernel configuration file to one's liking.

 sudo vi GHOSTBSD

Build and install the new kernel

 cd /usr/src
 sudo make buildkernel KERNCONF=GHOSTBSD
 sudo make installkernel KERNCONF=GHOSTBSD
 shutdown -r now