D14246.diff
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	Index: head/lib/libsysdecode/mkioctls
	===================================================================
	--- head/lib/libsysdecode/mkioctls
	+++ head/lib/libsysdecode/mkioctls
	@@ -17,18 +17,29 @@
	# XXX should we use an ANSI cpp?
	ioctl_includes=$(
	cd $includedir
	+ set -e
	+ # if /bin/sh is bash this will avoid further errors due to missing commands
	+ if set -o \| grep -q pipefail; then
	+ set -o pipefail
	+ fi

	filter='tee'
	- if [ "${MK_PF}" == "no" ]; then
	+ if [ "${MK_PF}" = "no" ]; then
	filter='egrep -v (net/pfvar\|net/if_pfsync)\.h'
	fi
	-
	- find -H -s * -name '*.h' \| \
	+ # find -s would avoid the need to invoke sort but it is non-portable
	+ find -L ./* -type f -name '*.h' \| \
	+ LC_ALL=C sort \| \
	$filter \| \
	xargs egrep -l \
	'^#[ ]define[ ]+[A-Za-z_][A-Za-z0-9_][ ]+_IO[^a-z0-9_]' \|
	awk '{printf("#include <%s>\\n", $1)}'
	)
	+
	+if [ -z "$ioctl_includes" ]; then
	+ echo "Failed to build list of ioctl headers"
	+ exit 1
	+fi

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