I'm working on a patch (more of a kludge :-( ) that will allow a few more OF packages to install.
But image, odepkg, fl-core and netcdf still won't build with it.
FYI, the development versions of Octave (3.9.0+, 4.1.0+) won't (cross-)build for 64-bit MinGW either, as (looking at the error messages) the same or similar issues arise in qthandles that has been integrated in core Octave.
So for the moment you're SOL.
What you can do is enter a bug in the bug tracker and be sure to include the error messages you see on screen (do: pkg install -verbose <package_name>)