make include directive and dependency generation with -MM

Question

I want a build rule to be triggered by an include directive if the target of the include is out of date or doesn\'t exist.

Currently the makefile looks like this:

Answer 1

The include directives work like they do in C and C++ - they are processed before anything else happens, to build the "real" makefile that make then processes. Specifically, they are processed before any rules are fired.