and, in both places where this appears, set the flag to ON:
```
-DBUILD_python=ON
-DBUILD_python_layer=ON
````
3. There are additional flags that need to be set: `PYTHON_EXECUTABLE=/usr/bin/python2.7` and `PYTHON_LIBRARY=/usr/lib/aarch64-linux-gnu/libpython2.7.so` for Python 2.7. Therefore, inside build, do: