Make instructions for xt/layers

cpio -iBcd < /dev/rfp021

cd dmd/xt/kern/sys
cp * /usr/include/sys
(also copy this directory to the sys directory of the UNIX PC source tree)

cd ../lddrv
(copy this directory to the lddrv directory of the UNIX PC source tree)

cd ../..
make -f layers.mk
(change directory to the lddrv source and make the xt.o load module)

