macOS install instructions

[sethpjohnson]

These could be incomplete because I've had some of these installed for years. Would be curious if it works well on a fresh install.

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Installing on macOS

Start by installing the Homebrew package manager. This can be done from the command line by pasting the supplied command into Terminal.

$ /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

Once Homebrew is ready to go use the following command to install required packages:

$ brew install openssl swig luajit pyenv

Typically Python 2 is installed on the mac by default and brew doesn't do a great job installing Python 3. To setup and install Python 3 without interfering with the default install or having to do manual aliasing we'll use pyenv to manage the different versions.

$ pyenv install 3.9.0

(3.9.0 is the current version at the time of this writing)

After Python 3 is installed you'll need to switch to 3.9.0

$ pyenv global 3.9.0

Add the following to your .bash_profile or .zshrc configuration file depending on which shell you are using.

if command -v pyenv 1>/dev/null 2>&1; then
  eval "$(pyenv init -)"
fi

Reset terminal, or start a new terminal, and use which to verify that pyenv is working.

$ exec $0
$ which python
/Users/username/.pyenv/shims/python
$ python -V
Python 3.9.0
$ pip -V
pip 20.2.3 from /Users/username/.pyenv/versions/3.9.0/lib/python3.9/site-packages/pip (python 3.9)

And finally, lets install m2crypto using the very long command below.

$ env LDFLAGS="-L$(brew --prefix openssl)/lib" \
CFLAGS="-I$(brew --prefix openssl)/include" \
SWIG_FEATURES="-cpperraswarn -includeall -I$(brew --prefix openssl)/include" \
pip install m2crypto

[sethpjohnson]

This may not work on Big Sur. Looks like pyenv not installing very well yet.

pyenv/pyenv#1643