[Zope] squishdot IOBtree dependency problem

[John Hunter]

I am trying to install squishdot-1-1-0 with zope-2.3.0.

When I try to restart Zope after unpacking squishdot in the Products
dir, I get the error

  File /usr/local/Zope/lib/python/Products/Squishdot/__init__.py, line 122, in ?
  File /usr/local/Zope/lib/python/Products/Squishdot/Squishdot.py, line 161, in ?
  File /usr/local/Zope/lib/python/Products/Squishdot/SquishSite.py, line 13, in ?
ImportError: No module named BTrees.IOBTree

SquishSite.py line 13 reads 'from BTrees.IOBTree import IOBTree'.

I notice that I have IOBtree c src files and shared libraries in my
zope distribution:

nitace:/usr/local/Zope> find . -name "IOBTree*"
./lib/Components/BTree/IOBTree.c
./lib/python/IOBTree.so

Is my build incomplete?

Any advice on what should be done?

Thanks,
John Hunter