DISTRO 'poky' not found

[Darren Hart <dvhart@linux.intel.com>]

I've run into this error several times during development of various things. It will be in a build tree that I have been working with for a while, then when I come back to it, I get the following. Any idea what triggers this? I suspect something in my workflow, but I can't imagine what it would be. I'd really like to not have to delete my build tree.

$ cd poky.git
$ source poky-init-build-env build-qemux86/

### Shell environment set up for Poky builds. ###

You can now run 'bitbake <target>'

Common targets are:
    poky-image-minimal
    poky-image-sato
    meta-toolchain
    meta-toolchain-sdk

You can also run generated qemu images with a command like 'poky-qemu qemux86'

$ bitbake linux-yocto
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_OS directly, or choose a MACHINE or DISTRO that does so.
DISTRO 'poky' not found. Please set a valid DISTRO in your local.conf


-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel