QNX4.25 NTP Install??

Hi,
I am using QNX 4.25 operating system.I trying to install the Network
Time Protocol (xntp3) on my machine.When i execute the command “make
install” in the xntp3 dir ,the make file for ntpd,ntpq ,etc are executed
successfully.But the installation stops when nt tries to install from
xntpd
saying
"make[1]:Entering directory 'xntp3/xntpd "
/usr/bin/x11/install -c -m 0755 xntpd /usr/local/bin
usr/bin/X11/install :command not found
Error 127. "

I do not have any X11 directory…could anybody tell me how to get the
X11 directory or any alternative way to get the installation done.
Thanks,
Ankit