How to install libffi-dev on Mac OS X

Error:

Library not loaded: /usr/local/opt/libffi/lib/libffi.7.dylib

The following worked (it’s not an ln -s but it did the trick):

sudo mkdir /usr/local/opt/libffi
sudo mkdir /usr/local/opt/libffi/lib
sudo cp /usr/lib/libffi.dylib /usr/local/opt/libffi/lib/libffi.7.dylib

Turns out Xcode already installs a library, it’s just not in the right spot.

On Mac OS X you just need:

$ brew install libffi

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