Don't explicitly link to header dir scope prefix anylonger, rely on
standard procedure to mkdir in rules.mk instead.
Signed-off-by: Jan Lindemann <jan@janware.com>
Use target all.link only aftr headers have been copied, to have build
directory searched for header files first.
Signed-off-by: Jan Lindemann <jan@jannet.de>
Support the PROJ_H variable, which is undefined by default.
PROJ_H is +=-added to SRC_H, thus solving failure to produce .dep.mk and copying
the stuff to the include directory.
I suppose this would be most cleanly handled in include.mk.
