There was a problem with getting the set of files for a build per the instructions. Ryan has just updated the PSF files in response to a bugzilla entry that I raised.
It is probably worth bringing down the latest versions if you want to build the latest code.
If you want 0.7, or 0.9.1, why do you want to build them? They are already available for download as executables on, or via, http://www.eclipse.org/osee/downloads.php