You have built the Boost library with thread support.

Don't forget to add -pthread to your linker options when
linking your code.

You have built the Boost.Python library. You have to add the following
options when building your own code:

Compiler options:
   -I/usr/local/include/python2.5 -I/usr/local/include

Linker options:
   -L/usr/local/lib/python2.5 -L/usr/local/lib -lboost_python -lpython2.5