download sources:

# svn checkout https://svn0.eu.FreeBSD.org/base/release/9.2.0 /usr/src

compile, install kernel:

# cd /usr/src 
# make buildworld 
# make buildkernel 
# make installkernel 
# shutdown -r now

install world (single mode):

# adjkerntz -i 
# mergemaster -p 
# cd /usr/src 
# make installworld 
# mergemaster 
# make delete-old 
# reboot 
# make delete-old-libs

sync source:

# svn switch https://svn.FreeBSD.org/base/release/11.1.0 /usr/jails/src
# svn up
# svn info

Path: .
Working Copy Root Path: /usr/jails/src
URL: https://svn.freebsd.org/base/release/11.1.0
Relative URL: ^/release/11.1.0
Repository Root: https://svn.freebsd.org/base
Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Revision: 321515
Node Kind: directory
Schedule: normal
Last Changed Author: gjb
Last Changed Rev: 321354
Last Changed Date: 2017-07-21 22:55:38 +0200 (Fri, 21 Jul 2017)

problems with svn:
svn info – info: Display information about a local or remote item.
svn status – status (stat, st): Print the status of working copy files and directories.
svn resolve – resolve: Resolve conflicts on working copy files or directories.