Can't run VNC server on QNX v6.2

Hi,

I downloaded VNC package from
http://www.nexwarecorp.com/support/qnx.htm#vnc.
But I can’t run the server correctly.
I get error saying “couldn’t find ‘xauth’ on your PATH”.
How can I fix this problem?

After unzipping and unarchived the package, I saw that they consist of
Xvnc
vncserver
vncconnect
vncviewer
vncpasswd


and they are in /usr/X11R6/bin directory.
Please help!

Thanks,
Eri