I've developed an mmtbx_probe_ext module that makes use of objects defined in iotbx_pdb. I've added that library to LIBS= in the SConscript file, and it is able to link and run properly. However, when a Python script imports mmtbx_probe_ext, that load fails unless the same script has previously imported from iotbx: The following works: from iotbx.map_model_manager import map_model_manager import mmtbx_probe_ext as probe But the following fails: import mmtbx_probe_ext as probe from iotbx.map_model_manager import map_model_manager ImportError: /home/taylorr/rlab/cctbx-reduce-python27/build/lib/mmtbx_probe_ext.so: undefined symbol: _ZNK5iotbx3pdb9hierarchy5chain5atomsEi How do I tell Sconscript (or what do I do in my _bpl file) to tell Python that it needs to load the other module first? Thanks, Russ Taylor --- Russell M. Taylor II, Ph.D. [email protected] [email protected] [email protected] [email protected] www.cs.unc.edu/~taylorr