Fails to build for me:

Writing /«PKGBUILDDIR»/debian/cia-clients/usr/lib/python2.7/dist-packages/bzr_cia-1.0.0.egg-info
BZR_PLUGINS_AT=cia@/«PKGBUILDDIR»/bzr-cia /usr/bin/bzr selftest -v -s bp.cia
failed to open trace file: [Errno 2] No such file or directory: '/sbuild-nonexistent/.bzr.log'
running 7 tests...
bzr selftest: /usr/bin/bzr
   /usr/lib/python2.7/dist-packages/bzrlib
   bzr-2.4b4 python-2.7.2 Linux-2.6.39-2-amd64-x86_64-with-Ubuntu-11.10-oneiric

bzrlib.plugins.cia.tests.test_cmds.TestBranch.test_get_cia_project   OK      129ms
bzr: ERROR: exceptions.AttributeError: '_TypeEqualityDict' object has no attribute 'clear'

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 930, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 1130, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 691, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.7/dist-packages/bzrlib/commands.py", line 713, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/builtins.py", line 3787, in run
    result = tests.selftest(**selftest_kwargs)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 3639, in selftest
    result_decorators=result_decorators,
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 3178, in run_suite
    result = runner.run(suite)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 791, in run
    test.run(result)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 3292, in run
    return super(CountingDecorator, self).run(result)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 3281, in run
    test.run(result)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/TestUtil.py", line 89, in run
    tests.pop().run(result)
  File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 491, in run
    return self.__RunTest(self, self.exception_handlers).run(result)
  File "/usr/lib/python2.7/dist-packages/testtools/runtest.py", line 74, in run
    return self._run_one(actual_result)
  File "/usr/lib/python2.7/dist-packages/testtools/runtest.py", line 88, in _run_one
    return self._run_prepared_result(ExtendedToOriginalDecorator(result))
  File "/usr/lib/python2.7/dist-packages/testtools/runtest.py", line 110, in _run_prepared_result
    result.stopTest(self.case)
  File "/usr/lib/python2.7/dist-packages/testtools/testresult/real.py", line 555, in stopTest
    return self.decorated.stopTest(test)
  File "/usr/lib/python2.7/dist-packages/bzrlib/tests/__init__.py", line 388, in stopTest
    type_equality_funcs.clear()
AttributeError: '_TypeEqualityDict' object has no attribute 'clear'

bzr 2.4b4 on python 2.7.2 (Linux-2.6.39-2-amd64-x86_64-with-
    Ubuntu-11.10-oneiric)
arguments: ['/usr/bin/bzr', 'selftest', '-v', '-s', 'bp.cia']
plugins: bash_completion[2.4b4], changelog_merge[2.4b4], cia[1.0.0dev],
    launchpad[2.4b4], netrc_credential_store[2.4b4], news_merge[2.4b4],
    weave_fmt[2.4b4]
encoding: 'ANSI_X3.4-1968', fsenc: 'ANSI_X3.4-1968', lang: None

*** Bazaar has encountered an internal error.  This probably indicates a
    bug in Bazaar.  You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.
----------------------------------------------------------------------
Ran 1 test in 0.134s

OK
make: *** [binary] Error 4
dpkg-buildpackage: error: fakeroot debian/rules binary gave error exit status 2