Well... I am going to put words in Sergey's mouth here...
image-sdk does not exist as a clanton recipe. Sergey copied image-full and named it image-sdk, I am guessing because he did not want to muck with a stock recipe.
I found other things in the build that referenced image-full by name, and I did not mind mucking with a stock recipe, so I made all my changes directly to image-full. Worked fine. I did mine as bitbake image-full.
As far as I can tell, the required conversion to glibc from ulibc comes about from the DISTRO line in yocto_build/conf/local.conf. Set it to:
DISTRO ?= "clanton-full"
Worth a shot... Full Linux on this board is a treat. With an ssh window open, I am finding it a very convenient c++ development station for helping with my son's homework. I am trying to convince him Microsoft C++ extensions are evil. Nice web server too, running Ruby on Rails.