Could you run this

dpkg -l '*rapi*'

to check the versions you have.

You could also try these commands

strings /usr/lib/python2.4/site-packages/pyrapi2.so|grep
rapi_connection_from

strings /usr/lib/librapi.so.2.0.0 |grep rapi_connection_from

which will show what function names each is using.

You could also try building from source, or try my packages at
www.mpellis.org.uk.

Mark