[cctbxbb] --enable-boost-threads flag

Greetings, If someone knows the answer off the top of their head, I would be interested in the answer. Otherwise, feel free to ignore this. Does the --enable-boost-threads flag for cctbx_sources/libtbx/configure.py do anything drastic besides include -pthread in the compiling and linking steps? I am trying to understand why I would get a free() error (for the shared_ptr to root_data) under the following situation: *) the iotbx_pdb shared library is configured without the --enable-boost-threads flag (on a linux box) *) sometimes reproducible from a test C++ program that is linked using -pthread even in the case when the program is as simple as loading a pdb file and creating the hierarchy. *) gcc 4.4.5 --Jeff Van Voorst