Failing since May 8.
https://uberchromegw.corp.google.com/i/chromiumos/builders/chromiumos-sdk/builds/8788

!!! '--save_install_plan=/tmp/install_plan.2557765' is not a valid package atom.
Starting fast-emerge.
 Building package --save_install_plan=/tmp/install_plan.2557765 system virtual/target-sdk world on root
Calculating deps...
ERROR   : Thu May 10 07:30:43 PDT 2018
ERROR   :  PGID  PPID   PID     ELAPSED     TIME %CPU COMMAND
ERROR   : Arguments of 10: ./setup_board '--board=amd64-host' '--accept_licenses=@CHROMEOS' '--skip_chroot_upgrade' '--nousepkg' '--reuse_pkgs_from_local_boards' '--save_install_plan=/tmp/install_plan.2557765'
ERROR   : Backtrace:  (most recent call is last)
ERROR   :  setup_board:256:main(), called: die_err_trap  
ERROR   : 
ERROR   : Command failed:
ERROR   :   Command 'sudo -E $EMERGE_CMD $HOST_FLAGS --select=y "${PACKAGES[@]}"' exited with nonzero code: 1
07:30:43: ERROR: 
return code: 1; command: /b/c/cbuild/repository/chromite/bin/cros_sdk 'PARALLEL_EMERGE_STATUS_FILE=/tmp/tmpoe5AU5' 'FEATURES=separatedebug' 'CHROME_ORIGIN=LOCAL_SOURCE' -- ./setup_board '--board=amd64-host' '--accept_licenses=@CHROMEOS' --skip_chroot_upgrade --nousepkg --reuse_pkgs_from_local_boards '--save_install_plan=/tmp/install_plan.2557765'
cmd=['/b/c/cbuild/repository/chromite/bin/cros_sdk', 'PARALLEL_EMERGE_STATUS_FILE=/tmp/tmpoe5AU5', 'FEATURES=separatedebug', 'CHROME_ORIGIN=LOCAL_SOURCE', '--', './setup_board', '--board=amd64-host', '--accept_licenses=@CHROMEOS', '--skip_chroot_upgrade', '--nousepkg', '--reuse_pkgs_from_local_boards', '--save_install_plan=/tmp/install_plan.2557765'], cwd=/b/c/cbuild/repository, extra env={'PARALLEL_EMERGE_STATUS_FILE': '/tmp/tmpoe5AU5', 'FEATURES': 'separatedebug', 'CHROME_ORIGIN': 'LOCAL_SOURCE'}
07:30:43: ERROR: ./setup_board failed (code=1)
07:30:43: INFO: Translating result ./setup_board failed (code=1) to fail.