Oracle Forms: error of frmcmp

We face the issue of with Oracle Forms compilation at RHEL 2.6.9-55.0.2.EL

We starts comp_fmx of standard Oracle Forms shipment and process finished with message:

access control disabled, clients can connect from any host

FRM-91500: Unable to start/complete the build.

Along the way script starts the

pgrep -f "Xvfb :4" >/dev/null
if [ $? -gt 0 ];then
Xvfb :4 -screen 0 6x6x8 -pn -fp /usr/X11R6/lib/X11/fonts/misc/ >& /dev/null &
fi
export DISPLAY=0:4.0

pgrep twm || twm &

Once I've commented the code and pointed DISPLAY at my workstation - compilation done properly.