portsnap alfred
cd /usr/ports/devel/subversion
make config-recursive
make install clean
rehash
Make sure to salvage custom kernel configuration files from /usr/src/sys/amd64/conf
rm -rf /usr/src
svn co https://svn0.us-east.FreeBSD.org/base/releng/9.0 /usr/src
cd /usr/src
svn switch ^/releng/9.1