Time to run the build and install world and kernel processes, not going to go through these commands in depth here. I am expecting that you already are familiar with them.
cd /jails/devel/ROOT/usr/src make buildworld make buildkernel make installkernel make installworld mergemaster -Ui -m /jails/devel/ROOT/usr/src -D /jails/devel/ROOT make -DBATCH_DELETE_OLD_FILES delete-old
Note: If your seeing this, and thinking I missed another delete file step, don't worry that's intentional it will be done later.
Before continuing the environment variables previously set need to be unset. As before I keep a file saved /jails/devel/unsetbuild.env which contains the commands to to this that I can copy and paste into the console.
cd /jails/devel cat /jails/devel/unsetbuild.env # Unset Jail Environment Build Options unsetenv MAKEOBJDIRPREFIX unsetenv DESTDIR unsetenv __MAKE_CONF unsetenv SRCCONF umount /jails/devel/ROOT/usr/src