Suggestion: Make qmake DEPENDPATH work for including Mac OS X frameworks

When having a project which is dependant on a Mac OS X framework
being developed,
it would be nice to have qmake build system pick up any dependencies on the
header files in this framework.

When trying to use DEPENDPATH for this purpose, it looks like
DEPENDPATH doesn't support dependencies in frameworks.

At the moment, a workaround would be to create a shadow directory
with symlinks to the framework headers, but as this is an ugly hack,
it would be nice to have it fixed properly in qmake, e.g. with a
syntax like:
DEPENDPATH += MyLibrary.framework