Some recent change has broken the chromiumos-sdk builder. It has tarted failing in the InitSDK stage (almost immediately) with the following error:

>>> Jobs: 0 of 1 complete, 1 running                Load avg: 1.33, 2.54, 3.80
>>> Emerging (1 of 1) sys-libs/ncurses-5.9-r99 from portage-stable
>>> Jobs: 0 of 1 complete, 1 running                Load avg: 1.33, 2.54, 3.80
>>> Installing (1 of 1) sys-libs/ncurses-5.9-r99
>>> Jobs: 0 of 1 complete, 1 running                Load avg: 1.30, 2.51, 3.78
>>> Jobs: 0 of 1 complete                           Load avg: 1.30, 2.51, 3.78
>>> Jobs: 1 of 1 complete                           Load avg: 1.30, 2.51, 3.78


 * IMPORTANT: config file '/etc/hosts' needs updating.
 * See the CONFIGURATION FILES section of the emerge
 * man page to learn how to update config files.
INFO    cros_sdk:make_chroot: Updating preinstalled build tools
[early_enter_chroot] /mnt/host/source/chromite/bin/parallel_emerge -uNv --select sys-apps/sandbox >=sys-devel/patch-2.7 sys-devel/automake sys-devel/bison
Traceback (most recent call last):
  File "/mnt/host/source/chromite/bin/parallel_emerge", line 77, in <module>
    from chromite.lib import commandline
  File "/mnt/host/source/chromite/bin/parallel_emerge", line 69, in load_module
    return __import__(mod)
  File "/mnt/host/source/chromite/__init__.py", line 9, in <module>
    import pkg_resources
ImportError: No module named pkg_resources
env: ccache: No such file or directory
Running ['/b/swarming/w/ir/cache/cbuild/repository/src/scripts/sdk_lib/make_chroot.sh', '--stage3_path', '/b/swarming/w/ir/cache/cbuild/repository/.cache/sdks/stage3-amd64-2014.09.18.tar.xz', '--chroot', '/b/swarming/w/ir/cache/cbuild/repository/chroot', '--cache_dir', '/b/swarming/w/ir/cache/cbuild/repository/.cache', '--nousepkg'] failed!
12:06:43: ERROR: 
return code: 1; command: /b/swarming/w/ir/cache/cbuild/repository/chromite/bin/cros_sdk --buildbot-log-version --bootstrap --replace '--chrome_root=/b/swarming/w/ir/cache/cbuild/repository/.cache/distfiles/target-master/chrome-src'
cmd=['/b/swarming/w/ir/cache/cbuild/repository/chromite/bin/cros_sdk', '--buildbot-log-version', '--bootstrap', '--replace', '--chrome_root=/b/swarming/w/ir/cache/cbuild/repository/.cache/distfiles/target-master/chrome-src'], cwd=/b/swarming/w/ir/cache/cbuild/repository, extra env={'FEATURES': 'separatedebug', 'CHROME_ORIGIN': 'LOCAL_SOURCE'}

12:06:43: ERROR: /b/swarming/w/ir/cache/cbuild/repository/chromite/bin/cros_sdk failed (code=1)
12:06:43: INFO: Translating result /b/swarming/w/ir/cache/cbuild/repository/chromite/bin/cros_sdk failed (code=1) to fail.
12:06:43: INFO: Running cidb query on pid 28825, repr(query) starts with <sqlalchemy.sql.expression.Update object at 0x7f03f6eb88d0>
12:06:43: INFO: Running cidb query on pid 28825, repr(query) starts with <sqlalchemy.sql.expression.Insert object at 0x7f03f6eb8950>