diff --git a/include/Makefile b/include/Makefile
index e68548719ba..4cd856e1b78 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -45,10 +45,10 @@ LDIRS=	cam msdosfs net netatalk netatm netgraph netinet netinet6 \
 	netipx netkey netncp netns nfs ntfs nwfs pccard posix4 sys vm
 
 LNOHEADERDIRS=	isofs ufs dev
-LSUBDIRS=	isofs/cd9660 ufs/ffs ufs/mfs ufs/ufs cam/scsi dev/usb
+LSUBDIRS=	isofs/cd9660 ufs/ffs ufs/mfs ufs/ufs cam/scsi dev/ppbus dev/usb
 
 # For SHARED=symlinks, cam is a symlink, so cam/scsi is taken care of
-LSYMSUBDIRS=	isofs/cd9660 ufs/ffs ufs/mfs ufs/ufs dev/usb
+LSYMSUBDIRS=	isofs/cd9660 ufs/ffs ufs/mfs ufs/ufs dev/ppbus dev/usb
 
 # Define SHARED to indicate whether you want symbolic links to the system
 # source (``symlinks''), or a separate copy (``copies'').  ``symlinks'' is