Update to 1.0.12.0. From the changelog:
- Add handling of exceptions from Database::get_metadata() and methods
  of Enquire which might throw DatabaseModifiedError to address
  situation reported in ticket#284.
- Skip thread.t testcase if Perl is new enough, but wasn't built with
  thread support (reported by Felix Antonius Wilhelm Ostmann).
- Fix "fake VPATH" mode to work better.
- Add test coverage for more WritableDatabase methods.
- Wrap the new FLAG_DEFAULT constant which gives the QueryParser
  default flag settings, allowing you to easily add flags to the
  default ones.
- Makefile.PL now supports a "fake VPATH" mode, to better support for
  building from SVN.  If you run "perl /path/to/Makefile.PL" then
  Makefile.PL will run Makefile.PL as nomal in /path/to, and then
  create a stub Makefile in the current directory which forwards any
  make invocations.
- Wrap Search::Xapian::get_major_version(), get_minor_version(),
  get_revision(), sortable_serialise(), and sortable_unserialise().
- Reject xapian-core < 1.0 with an error rather than just a warning.

(schmonz)