I think a change added to r267 introduced a build problem. I don't
think this line is needed in Storage.hh:
#include <tr1/unordered_map>
(from http://mailman.icsi.berkeley.edu/pipermail/time-machine/2011-July/000021.html)
It keeps time-machine from building, and there is no tr1 sub-directory.
BTW: thanks for the filename patch, I'm trying it out...