In order to install 11Gr2 I need to connect to Xwindow.
[root@unknown]vncserver
vncserver: couldn't find "xauth" on your PATH.
[root@unknown]ln -s /usr/openwin/bin/xauth /usr/bin/
[root@unknown]vncserver
vncserver: couldn't find "Xvnc" on your PATH.
[root@unknown]ln -s /usr/X11/bin/Xvnc /usr/bin/
[root@unknown]vncserver
New 'unknown:1 ()' desktop is unknown:1
Starting applications specified in //.vnc/xstartup
Log file is //.vnc/unknown:1.log
[root@unknown]vncserver -kill :1
Killing Xvnc process ID 3310
[root@unknown]netstat -an | grep "LIST" | grep 5901
*.5901 *.* 0 0 49152 0
LISTEN
then modify the config file.
vi .vnc/xstartup
#!/bin/sh
#[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
#xsetroot -solid grey
#vncconfig -iconic &
#xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop"
&
#twm &
gnome-session
to kill vnc :1
$ vncsever kill :1
restart it
vncserver
then it work well through vnc viewer.