I have succesfully installed GNUstep from Mandriva development.
Unforunately everytime I run aplications using openapp, there is a warning:

Warning - mouse/pointer seems to have more than 5 buttons - just
using one to five

Content of /etc/X11/xorgconf:
# Identifier and driver
Identifier"Mouse1"
Driver"mouse"
Option "Protocol" "PS/2"
Option "Device" "/dev/mouse"
Option "Buttons" "3"

There is no information about GNUstep mouse configuration:

http://gnustep.made-it.com/Configuration/index.html

The only workaround is deleting the warning inside this file:
XGServerWindows.m

How to solve this problem?
Thank you.