Makefile: allow command-line overrides

To enable the DBEUG configuration option, it is now sufficient to
call:

	$ DEBUG=true make

instead of having to edit the Makefile.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
1 file changed
tree: 98d7d4a3d9588de3ccc419370b28df91df6397e0
  1. build/
  2. config/
  3. debug/
  4. doc/
  5. hotplug/
  6. man/
  7. src/
  8. udev/
  9. .gitignore
  10. COPYING
  11. Makefile