Error during pjproject with python3 building.

There is pjproject 2.12 which I try to build.
I used to python3-pjsip cloned from here.
But the following error is appeared:
running install_egg_info
```
Writing pjproject-2.12.1/debian/tmp/usr/lib/python3/dist-packages/pjsua-2.12.1.egg-info
W: pybuild base:249: missing command (plugin=distutils, method=test, interpreter=python3, version=3)
```

How do correct it ?