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	includedir="$1"			includedir="$1"

	LC_ALL=C; export LC_ALL			LC_ALL=C; export LC_ALL

	# Build a list of headers that have ioctls in them.			# Build a list of headers that have ioctls in them.
	# XXX should we use an ANSI cpp?			# XXX should we use an ANSI cpp?
	ioctl_includes=$(			ioctl_includes=$(
	cd $includedir			cd $includedir

				filter='tee'
				if [ "${MK_PF}" == "no" ]; then
				filter='egrep -v (net/pfvar\|net/if_pfsync)\.h'
				fi

	find -H -s * -name '*.h' \| \			find -H -s * -name '*.h' \| \
	egrep -v '(net/pfvar\|net/if_pfsync)\.h' \| \			$filter \| \
	xargs egrep -l \			xargs egrep -l \
	'^#[ ]define[ ]+[A-Za-z_][A-Za-z0-9_][ ]+_IO[^a-z0-9_]' \|			'^#[ ]define[ ]+[A-Za-z_][A-Za-z0-9_][ ]+_IO[^a-z0-9_]' \|
	awk '{printf("#include <%s>\\n", $1)}'			awk '{printf("#include <%s>\\n", $1)}'
	)			)

	awk -v x="$ioctl_includes" 'BEGIN {print x}' \|			awk -v x="$ioctl_includes" 'BEGIN {print x}' \|
	$CPP -nostdinc -I$includedir -dM -DCOMPAT_43TTY - \|			$CPP -nostdinc -I$includedir -dM -DCOMPAT_43TTY - \|
	awk -v ioctl_includes="$ioctl_includes" '			awk -v ioctl_includes="$ioctl_includes" '
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