Can't install psycopg2 package through pip install… Is this because of Sierra?

Question

I am working on a project for one of my lectures and I need to download the package psycopg2 in order to work with the postgresql database in use. Unfortunately, when I try

Answer 1

Running into a similar problem using pipenv install psycopg2:

ld: library not found for -lssl', ' clang: error: linker command failed with exit code 1 (use -v to see invocation)', " error: command 'clang' failed with exit status 1", '
----------------------------------------',

I tried all of the recommendations above and none of them worked. I'd faced this problem in another virtualenv a few months ago and remembered reading something about this being a psycopg2 version issue. So I tried installing with 2.7.1 and 2.8.3 and both still failed. Somehow version 2.7.7 worked:

pipenv install psycopg2==2.7.7

Wish I had time to look into this further to understand what's really happening. But for now I don't and this worked.