[Distutils] How to build python-packages depends on the output of other project

hi, I'm writing python-binding for project A. My python-binding depends on the compile output of project A(It is a .so file), and the project A is not installed in the system(so we can't find the .so files in the system libraries pathes) What's the elegant way to package my python-binding, so that I can install everything by run `python setup.py` ? Any suggestions and comments will be appreciated :) -- Best wishes, Young