Make error: missing separator

Question

I am getting the following error running make:

Makefile:168: *** missing separator.  Stop.

What is causing this?

Answer 1

Just for grins, and in case somebody else runs into a similar error:

I got the infamous "missing separator" error because I had invoked a rule defining a function as

($eval $(call function,args))

rather than

$(eval $(call function,args))

i.e. ($ rather than $(.