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Looking closer at the issue with rosinstall, it seems to have an infinite loop in : /usr/local/lib/python2.6/dist-packages/yaml/constructor.py line 256 :

    inf_value = 1e300
while inf_value != inf_value*inf_value:
    inf_value *= inf_value
nan_value = -inf_value/inf_value   # Trying to make a quiet NaN (like C99).

Might be because the bifferboard doesn't have an FPU? Comparing some python statements between the bifferboard and my workstation, it looks like the bifferboard has no inf in addition to strangely handling nan.

With an ugly hack, I could circumvent the problem. I filed a report with yaml: http://pyyaml.org/ticket/253