There is a variable EXTRA_INCVPATH and I think it can be made variant 
specific, i.e. EXTRA_INCVPATH_x86
Check the recursive makefile doc.

Greg Kilfoyle wrote:
> We have some header files that relate to our specific hardware that we need to get placed in qnx_target/usr/include. 
There's no source files to compile in this case.
>
> I can't find an example of a project directory which just contains headers. They all contain assembly or .c source 
files to compile.
>
> For example, I want to create:
>
>   src/hardware/foo/public/bar/xyzzy.h
>
> ...and have xyzzy.h copied to qnx_target/usr/include/bar as part of the hinstall processing.
>
> It's not clear to me which make file "triggers" the hinstall processing.
>
> I started with creating a basic Makefile in the foo directory that just contained:
>
> LIST=foo
> include recurse.mk
>
> But it seems like I need a common.mk and a lower directory to include it.
>
> I could just place the files in src/hardware/startup/lib/public, but didn't really want to use that approach.
>
>
>
> _______________________________________________
>
> General
> http://community.qnx.com/sf/go/post60497
>
>