NPPP               66 kern/tty_conf.c #if NPPP > 0
NPPP              122 kern/tty_conf.c #if NPPP > 0
NPPP              107 net/if_ppp.c   #if NPPP > 0
NPPP               54 net/netisr_dispatch.h #if NPPP > 0
NPPP               96 net/ppp_tty.c  #if NPPP > 0