bitbake

$ MACHINE=overo  bitbake virtual/kernel
Pseudo is not present but is required, building this first before the main build
ERROR: Execution of event handler 'check_sanity_eventhandler' failed
ERROR:  Poky's config sanity checker detected a potential misconfiguration.
    Either fix the cause of this error or at your own risk disable the checker (see sanity.conf).
    Following is the list of potential problems / advisories:

    Please set TARGET_ARCH directly, or choose a MACHINE or DISTRO that does so.
Please set a valid MACHINE in your local.conf