vncserver: couldn't find "Xvnc" on your PATH

vncserver: couldn't find "Xvnc" on your PATH
=============================================

gv005# su - oracle

$ vncserver
vncserver: couldn't find "Xvnc" on your PATH.
$ vncserver :1
vncserver: couldn't find "Xvnc" on your PATH.
$ PATH=$PATH:/usr/X/bin:/usr/X11/bin
$ export PATH
$ vncserver

You will require a password to access your desktops.

Password:
Verify:
xauth:  creating new authority file /export/home/oracle/.Xauthority

New 'gv005:5 ()' desktop is gv005:5

Creating default startup script /export/home/oracle/.vnc/xstartup
Starting applications specified in /export/home/oracle/.vnc/xstartup
Log file is /export/home/oracle/.vnc/gv005:5.log

$