How I got it to work as I did not specify wheelmouse when installing. (I assume that works. Please inform if not the case)

run mouseconfig it asks 2 questions in sequence
question 1 asks type of mouse: indicate ps2
then it asks if wheelmouse (y)
restarted x and no joy
then I Edited XF86Config-4
changing :
Option "Protocol" "PS/2"
to
Option "Protocol" "IMPS/2"
thusly...
Section "InputDevice"
Identifier "PS/2 Mouse"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "true"
Option "Emulate3Timeout" "70"
Option "SendCoreEvents" "true"
Option "ZAxisMapping" "4 5"
EndSection

It now works. Don't know if mouseconfig was necassary but suspect it was. ???