python - Install Scrapy-Deltafetch: Can't find local Berkeley DB -

i'm trying install scrapy-deltafetch in virtual-environment (as described here) on new raspberry pi 3 raspbian.

when i'm running pip install scrapy-deltafetch in virtualenv, i'm getting this:

python setup.py egg_info: can't find local berkeley db installation

command "python setup.py egg_info" failed error code 1 in /tmp/pip-build-ib6d93/bsddb3/

however when i'm running sudo pip install scrapy-deltafetch outside of virtual-environment works fine.

does has idea of how install scrapy-deltafetch in virtualenvironment?

your system missing berkeley db, used deltafetch store requests data.

so, first install berkeley db in system (found this tutorial in quick search).

after that, have install bsddb3 python package (you can follow instructions this answer).