/build$ make -v
GNU Make 4.1
Built for x86_64-pc-linux-gnu
Copyright (C) 1988-2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

/build$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial

/build$ make -f 2019-03-21/01-abspath-mk.mk
Makefile absolute pathname: /build/2019-03-21/01-abspath-mk.mk
Makefile absolute path: /build/2019-03-21/