Stephane,

#include is a compile time thing, it can't evaluate a string.

If you have a SET PATH environment in place you should be able to just:

#include test.h


>Is there any way for this to work ?
>
>

>
>*-- c:\test\Test.h
>#define MyTest 1
>
>*-- Some program
>#define build_root "c:\Test\"
>#include build_root + "Test.h"
>? MyTEST && Error: Variable MyTest is not found
>
>