Cannot install on OS X: C compiler cannot find ffi.h

[nathancarter]

Hello.

Following the directions here to install on OSX (10.11.6), I did this:

1. Installed Cairo (using Homebrew, as brew install cairo).
2. Installed ez_setup (using pip, as sudo pip install ez_setup).
3. Tried to install Gizeh, and failed. Details:

I typed: sudo pip install gizeh
It did:

Collecting gizeh
  Downloading gizeh-0.1.10.tar.gz
Collecting cairocffi (from gizeh)
  Downloading cairocffi-0.8.0.tar.gz (79kB)
    100% |████████████████████████████████| 81kB 1.3MB/s
    Complete output from command python setup.py egg_info:
    c/_cffi_backend.c:15:10: fatal error: 'ffi.h' file not found
    #include <ffi.h>
             ^
    1 error generated.

(Followed by many Python errors that are just a big stacktrace pointing to this C compiler error.)

Did I follow the directions incorrectly? Is there a step missing? Any help appreciated, thanks.

Nathan

[HyggeHacker]

I've had the same issue on another project. Glad to see you were never responded too :(

[nathancarter]

Turns out I had both pip and pip3 installed on my system, and replacing all pip calls with pip3 calls seems to have correctly installed Gizeh. Of course, now it's 1.5 years later, so I don't remember what in the world I actually wanted Gizeh for, so I don't intend to test it now. But it installed correctly. I think?