Can't install psycopg2 package through pip install... Is this because of Sierra?
<p>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 to pip install psycopg2 the following error pops up:</p>

<pre><code>ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command '/usr/bin/clang' failed with exit status 1
ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command '/usr/bin/clang' failed with exit status 1
</code></pre>

<p>Does anyone know why this is happening? Is it because Sierra has not supported some packages? Thanks in advance!</p>

<p>I fixed this by installing Command Line Tools</p>

<pre><code>xcode-select --install
</code></pre>

<p>then installing openssl via Homebrew and manually linking my homebrew-installed openssl to pip:</p>

<pre><code>env LDFLAGS="-I/usr/local/opt/openssl/include -L/usr/local/opt/openssl/lib" pip install psycopg2
</code></pre>

<p>on macOS Sierra 10.12.1</p>

python pip psycopg2