Here is the bug report for graphviz failure against Python 2.7 in Ubuntu Natty:
https://bugs.launchpad.net/ubuntu/+source/graphviz/+bug/683182/+index Here's the debdiff I applied to our package to get it to build: https://bugs.launchpad.net/ubuntu/+source/graphviz/+bug/683182/+attachment/1755021/+files/683182.debdiff
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