Problem
Makefile does not rebuild code if include file is modified
Solution
The acsMakefile builds dependencies only for "user include files", i.e. for files included in the following way:
#include "myInclude.h"
and not for "system include files":
#include <aSystemInclude.h>
If a change in your include file does not trigger the Makefile to rebuild your code, you are including it with <> instead of "".
acsMakefile behaves in this way to keep manageable the list of dependencies and speeding up compilation time. To do this, it uses the -MM CPP compiler option when building dependencies, instead of -M that would build a huge complete dependency list including all system include files.