* Emmanuel Kasper <e.kasper@proxmox.com>, 2016-04-14, 13:29:
in the Debian policy 4.9.1 we recommend to add build flags as such: MAKEFLAGS += -j$(NUMJOBS) and I guess most packages, like tar, will then call $(MAKE) $(MAKEFLAGS)
You don't need to pass $(MAKEFLAGS) here.And, as you noticed, you shouldn't, because it's not always suitable as arguments for make.
-- Jakub Wilk