Mine

*** module meta-sugar-platform not built due to non buildable evince-olpc *** [35/46]

and then, after a bit more stuff, I end up with:

*** Building read-activity *** [37/46]

python setup.py build
Traceback (most recent call last):
  File "setup.py", line 19, in <module>
    from sugar.activity import bundlebuilder
ImportError: No module named sugar.activity