Peter Kasper:
i'm trying to run obfsproxy on freebsd 9.1, i have installed packages obfsproxy-0.1.4,1 and tor-devel-0.2.4.12.a
You should switch to the more recent Python implementation of Obfsproxy.
See https://www.torproject.org/projects/obfsproxy-instructions.html.en for installation instructions.
Hope that helps,