/usr/src/blktap-2.0.91/Makefile is in blktap-dkms 2.0.91-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3
obj-m := blktap.o blktap-objs := control.o ring.o device.o request.o sysfs.o