makefile - Fail in make (gmake) -

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I have a bunch of variables in my GNU makefile, and users can change their values ​​if some values ​​mean any If not, then I want to fail the makefile before executing.

For example: 

  FOODIR = foo BARDIR = bar

OK, but if the user has it

< Sets up for> FOODIR = foo BARDIR = foo

, I'm looking for the right syntax to do the makefile to fail. Something like this: 

  ifeq ($ (food), $ (bardir)) exit 1; Endiff

But this does not work What is the best way to do this?

The makefile shell script is not; You can not use shell commands like exit .

A GNU make function is $ (error ...) you can use (if you have recently enough to make your GNU):

< Pre> ifeq ($ (edible), $ (boder)) $ (error food is similar to bankrupt bird: $ (edible)) endif

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