Paul Brook writes ("Re: [Qemu-devel] [PATCH] CPPFLAGS+= in Makefile.target"):
> No. This doesn't do what you thing it does.
> The most common way of overriding these variables is to pass them on the
> commandline, i.e. "make CPPFLAGS=-blah". This overrides all assignments to
> that variable including +=.Err, yes (and this is annoying behaviour in make), but if Makefile.target sets CPPFLAGS=-I... then even config.mak cannot override it. Ian.
