Index: if_pppx.c
===================================================================
RCS file: /cvs/src/sys/net/if_pppx.c,v
retrieving revision 1.72
diff -u -p -r1.72 if_pppx.c
--- if_pppx.c	23 Jan 2020 01:22:59 -0000	1.72
+++ if_pppx.c	24 Jan 2020 05:15:25 -0000
@@ -42,6 +42,9 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
+
+#include "pf.h"
+
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/buf.h>
@@ -93,6 +96,10 @@
 #include <net/pipex_local.h>
 #else
 #error PIPEX option not enabled
+#endif
+
+#if NPF > 0
+#include <net/pfvar.h>
 #endif
 
 #ifdef PPPX_DEBUG