Index: lib/libsysdecode/Makefile
===================================================================
--- lib/libsysdecode/Makefile
+++ lib/libsysdecode/Makefile
@@ -122,7 +122,7 @@
 ioctl.c: .PHONY
 .endif
 ioctl.c: mkioctls .META
-	env CPP="${CPP}" \
+	env CPP="${CPP}" MK_PF="${MK_PF}" \
 	    /bin/sh ${.CURDIR}/mkioctls ${SYSROOT:U${DESTDIR}}${INCLUDEDIR} > ${.TARGET}
 
 beforedepend: ioctl.c tables.h
Index: lib/libsysdecode/mkioctls
===================================================================
--- lib/libsysdecode/mkioctls
+++ lib/libsysdecode/mkioctls
@@ -17,8 +17,15 @@
 # XXX should we use an ANSI cpp?
 ioctl_includes=$(
 	cd $includedir
+
+	filter='(.*disk.*)\.h'
+	if [ "${MK_PF}" == "no" ]
+	then
+		filter="(${filter})|((net/pfvar|net/if_pfsync)\.h)"
+	fi
+
 	find -H -s * -name '*.h' | \
-	egrep -v '(.*disk.*|net/pfvar|net/if_pfsync)\.h' | \
+	egrep -v $filter | \
 		xargs egrep -l \
 '^#[ 	]*define[ 	]+[A-Za-z_][A-Za-z0-9_]*[ 	]+_IO[^a-z0-9_]' |
 		awk '{printf("#include <%s>\\n", $1)}'