The archive for v0.8.1 misses the files : - [cmake/version_script.txt](https://github.com/symengine/symengine.py/blob/master/cmake/version_script.txt) - [cmake/get_suffix.py](https://github.com/symengine/symengine.py/blob/master/cmake/get_suffix.py) Which are required to build it seems.