Following the directions here: https://github.com/bitcoin/bitcoin/blob/0.7.2/doc/readme-qt.rst
With a fresh install of MinGW, Qt 4.8.4, and the specified dependencies archive, I get:
\bitcoin\src\keystore.h:10: error: boost/signals2/signal.hpp: No such file or directory
Along with other errors about signals2. There is no signals2 in the dependencies archive. I'm guessing the archive hasn't been updated in awhile and contains an old version of boost.
Perhaps the link to the archive should be removed until it is updated (it's the same in master branch), and the readme should just instruct users to build boost, etc. themselves.