In PCLinuxOS has no ros session packages, but Open Mandriva packages are working with PCLinuxOS. Inttall the next packages
rox-2.10-3-omv4000.x86_64.rpm
rox-session-0.30-7-omv4002.noarch.rpm
rox-lib-2.0.6-2-omv4002.noarch.rpm
You can find them from
https://pkgs.org/search/?q=rox-session
These packages are in my PCLinuxOS
You need to install IceWM also and then add rox-session to the .icewm/startup file. My startup file looks like
#!/bin/sh
##idesk &
redshift &
conky &
nm-applet &
rox-session &