Failed build: https://uberchromegw.corp.google.com/i/chromeos/builders/guado_moblab-paladin/builds/5058

Error:

@@@STEP_FAILURE@@@
13:04:19: ERROR: <class 'chromite.lib.cros_build_lib.RunCommandError'>: return code: 1; command: /b/cbuild/internal_master/chromite/bin/cros_sdk -- emerge-guado_moblab -p --cols --quiet --root /var/empty -e virtual/target-os
 * Generating locale-archive: forcing # of jobs to 1

emerge: there are no ebuilds to satisfy "x11-base/xorg-server" for /var/empty/.
(dependency required by "dev-python/matplotlib-1.3.1-r1::chromiumos" [ebuild])
(dependency required by "chromeos-base/autotest-server-deps-0.0.1-r5::chromiumos" [ebuild])
(dependency required by "chromeos-base/autotest-server-0.0.1-r3021::chromiumos" [ebuild])
(dependency required by "chromeos-base/chromeos-bsp-moblab-0.0.5-r48::moblab" [ebuild])
(dependency required by "virtual/chromeos-bsp-3.5-r1::guado_moblab" [ebuild])
(dependency required by "virtual/target-chromium-os-1-r64::chromiumos" [ebuild])
(dependency required by "virtual/target-os-3.5-r1::mobbase-private" [ebuild])
(dependency required by "virtual/target-os" [argument])

cmd=['/b/cbuild/internal_master/chromite/bin/cros_sdk', '--', 'emerge-guado_moblab', '-p', '--cols', '--quiet', '--root', '/var/empty', '-e', 'virtual/target-os'], cwd=/b/cbuild/internal_master
Traceback (most recent call last):
  File "/b/cbuild/internal_master/chromite/lib/failures_lib.py", line 172, in wrapped_functor
    return functor(*args, **kwargs)
  File "/b/cbuild/internal_master/chromite/cbuildbot/stages/android_stages.py", line 124, in PerformStage
    version = self._run.DetermineAndroidVersion(boards=[board])
  File "/b/cbuild/internal_master/chromite/cbuildbot/cbuildbot_run.py", line 944, in FuncWrapper
    return result(*args, **kwargs)
  File "/b/cbuild/internal_master/chromite/cbuildbot/cbuildbot_run.py", line 859, in DetermineAndroidVersion
    package = self.DetermineAndroidPackage(board)
  File "/b/cbuild/internal_master/chromite/cbuildbot/cbuildbot_run.py", line 832, in DetermineAndroidPackage
    packages = portage_util.GetPackageDependencies(board, 'virtual/target-os')
  File "/b/cbuild/internal_master/chromite/lib/portage_util.py", line 1741, in GetPackageDependencies
    capture_output=True).output.splitlines()
  File "/b/cbuild/internal_master/chromite/lib/cros_build_lib.py", line 625, in RunCommand
    raise RunCommandError(msg, cmd_result)
RunCommandError: return code: 1; command: /b/cbuild/internal_master/chromite/bin/cros_sdk -- emerge-guado_moblab -p --cols --quiet --root /var/empty -e virtual/target-os
 * Generating locale-archive: forcing # of jobs to 1

emerge: there are no ebuilds to satisfy "x11-base/xorg-server" for /var/empty/.
(dependency required by "dev-python/matplotlib-1.3.1-r1::chromiumos" [ebuild])