How to force an error in a gnumake file

Question

I want to detect a condition in my makefile where a tool is the wrong version and force the make to fail with an error message indicating the item is not the right version.<

Answer 1

From the manual:

$(error Bad svn version v1.4, please install v1.6)

This will result make to a fatal error:

$ make
Makefile:2: *** Bad svn version v1.4, please install v1.6.  Stop.