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Two results for which -a pg_config, trying to install psycopg2 on Mac

I am trying to install pyscopg2 (using pip) on Sierra.

Seems to be a common problem, so I've checked out a handful of other SO answers. I tried the solution from here.

But I still can't install. My error is

Could not find a version that satisfies the requirement pyscopg2 (from versions: )
No matching distribution found for pyscopg2

When I run which -a pg_config, I get TWO lines:

/Applications/Postgres.app/Contents/Versions/9.5/bin//pg_config
/Applications/Postgres.app/Contents/Versions/9.5/bin/pg_config

Which feels wrong.

1\ Is the double pg_config the source of my problem?

2\ If so, how do I correct?

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