MacPorts compatibility issue

[amamaenko]

Checklist

Here is the list of steps that are different so far as I got, when installing MacOS with MacPorts

Steps

1. first install the C++ libraries that we would need later:

sudo port install automake libtool pkgconfig libffi gmp openssl

Note that the MacPorts has pkgconfig library name rather than pkg-config in
Brew or linuxes.

2. Next step is to build one of pyethapp dependencies - the scrypt module
   using a trick. The reason for this trick is described at:
   https://cryptography.io/en/latest/installation/#building-cryptography-on-os-x,
   and a solution is described at: #209
   Basically, the pyethapp setup relies on system packages for openssl, so,
   instead of modifying its setup scripts, we're going to simply preinstall the
   dependency manually:
   env LDFLAGS="-L/opt/local/lib" CFLAGS="-I/opt/local/include" pip install scrypt

3. Installing from an egg/wheel doesn't work, so clone the pytheapp module and run the "Development" setup
   cd pyethapp
USE_PYETHEREUM_DEVELOP=1 python setup.py develop

4. THE TRICKIEST: Fix the devp2p module.
   In the devp2p/crypto.py fix the openssl import path. Make sure to include the
   MacPorts' library into the lib path. Correct lib path below:

_openssl_lib_paths = ['/usr/local/Cellar/openssl/', '/opt/local/bin/']

System/environment

• MacOS 10.13.2 (High Sierra) freshly installed.
  • standard libraries for openssl removed in this version
• MacPorts 2.4.2 already installed (see https://www.macports.org)
  • some packages have different names from Brew
• Python 3.6.4 installed from macports as python3
  • pytheapp hacked in python 2.7, so it won't install from pypi on 3.6

Expected behaviour

Instead of step 3, the install should go fine

Observed behaviour

required ciphers {'aes-128-ctr'} not available in openssl library'

Steps to reproduce

After the above installation start:

python[3] -m pyethapp.app