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Installation Troubleshooting Guide

Errors Installing the "cffi" Package

If you see the error shown below on OS X, then there was an issue installing the cffi package.

c/_cffi_backend.c:15:10: fatal error: 'ffi.h' file not found
    #include <ffi.h>

To fix this, try installing libffi via brew:

$ brew install libffi

Errors Installing the "cryptography" Package

If you see the error shown below on OS X, then there was an issue installing the cryptography package.

build/temp.macosx-10.10-x86_64-2.7/_openssl.c:423:10: fatal error: 'openssl/e_os2.h' file not found
    #include <openssl/e_os2.h>

To fix this issue, try upgrading Xcode Command Line Tools:

$ xcode-select --install

Then, make sure that openssl is installed and re-link it:

$ brew install openssl
$ brew link openssl --force