/usr/src/linux-headers-5.15.0-181/net/lapb
Edit: /usr/src/linux-headers-5.15.0-181/net/lapb/Makefile (181B)
# SPDX-License-Identifier: GPL-2.0-only
#
# Makefile for the Linux LAPB layer.
#
obj-$(CONFIG_LAPB) += lapb.o
lapb-y := lapb_in.o lapb_out.o lapb_subr.o lapb_timer.o lapb_iface.o