You dont have extra and patches repository enabled.
Open the file as root with your favorite editor and make the file to look like this.
WORKINGDIR=/home/ftp/pub/veclinux/packages
EXCLUDE=kernel,kernel-ide,kernel-source,kernel-headers,kernel-modules
SOURCE=http://vectorlinux.osuosl.org/veclinux-5.9/packages/
SOURCE=http://vectorlinux.osuosl.org/veclinux-5.9/patches/
SOURCE=http://vectorlinux.osuosl.org/veclinux-5.9/extra/
#DISABLED=file:///mnt/cdrom/packages/
#DISABLED=http://vectorlinux.osuosl.org/veclinux-5.9/testing/
Then as root from the command line do
slapt-get -u
As usual in Linux, there is always one more way to do it. You can also open Gslapt, go to Edit, Preferences, Sources, and select the same urls. After that hit the update button and you will be ready to go.
Let us know how it goes, and post back if you hit any problem.