Added instructions for instalation with OpenSSL from MacPorts
diff --git a/docs/installation.rst b/docs/installation.rst
index c6a2a5c..eb1f85f 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -94,19 +94,31 @@
------------------------------
To link cryptography against a custom version of OpenSSL you'll need to set
-``ARCHFLAGS``, ``LDFLAGS``, and ``CFLAGS``. OpenSSL can be installed via
-`Homebrew`_:
+``ARCHFLAGS``, ``LDFLAGS``, and ``CFLAGS``. OpenSSL can be installed via `Homebrew`_:
.. code-block:: console
$ brew install openssl
+or `MacPorts`_:
+
+.. code-block:: console
+
+ $ sudo port install openssl
+
+
Then install cryptography linking against the brewed version:
+on `Homebrew`_:
.. code-block:: console
$ env ARCHFLAGS="-arch x86_64" LDFLAGS="-L/usr/local/opt/openssl/lib" CFLAGS="-I/usr/local/opt/openssl/include" pip install cryptography
+on `MacPorts`_:
+.. code-block:: console
+
+ $ env ARCHFLAGS="-arch x86_64" LDFLAGS="-L/opt/local/lib" CFLAGS="-I/opt/local/include" pip install cryptography
.. _`Homebrew`: http://brew.sh
+.. _`MacPorts`: http://www.macports.org
.. _`pre-compiled binaries`: https://www.openssl.org/related/binaries.html