Problems when creating directories with "make install" (no mkdir -p on Windows)

The mkspecs tell qmake how to make a directory. Unfortunately, while Unix platforms have mkdir -p, Windows does not. As a result if you have an install rule:

foo.files = foo
foo.path = /exists/missing/missing

The Makefile ends up with a statement like this:

if not exist /exists/missing/missing mkdir /exists/missing/missing

Both "if not exist" and "mkdir" come from the mkspec.

The problem with this statement is that it fails due to the first missing directory. mkdir cannot create multiple levels of directories.

It would be great if qmake could generate code more like this:

if not exist /exists mkdir /exists
if not exist /exists/missing mkdir /exists/missing
if not exist /exists/missing/missing mkdir /exists/missing/missing