Installation and Status

Quick installation for CPython (cffi is distributed with PyPy):

In more details:

This code has been developed on Linux, but should work on any POSIX platform as well as on Windows 32 and 64. (It relies occasionally on libffi, so it depends on libffi being bug-free; this may not be fully the case on some of the more exotic platforms.)

CFFI supports CPython 2.6, 2.7, 3.x (tested with 3.2 to 3.4); and is distributed with PyPy (CFFI 1.0 is distributed with and requires PyPy 2.6).

The core speed of CFFI is better than ctypes, with import times being either lower if you use the post-1.0 features, or much higher if you don’t. The wrapper Python code you typically need to write around the raw CFFI interface slows things down on CPython, but not unreasonably so. On PyPy, this wrapper code has a minimal impact thanks to the JIT compiler. This makes CFFI the recommended way to interface with C libraries on PyPy.


  • CPython 2.6 or 2.7 or 3.x, or PyPy (PyPy 2.0 for the earliest versions of CFFI; or PyPy 2.6 for CFFI 1.0).
  • in some cases you need to be able to compile C extension modules; refer to the appropriate docs for your OS. This includes installing CFFI from sources; or developing code based on ffi.set_source() or ffi.verify(); or installing such 3rd-party modules from sources.
  • on CPython, on non-Windows platforms, you also need to install libffi-dev in order to compile CFFI itself.
  • pycparser >= 2.06: (automatically tracked by pip install cffi).
  • py.test is needed to run the tests of CFFI itself.

Download and Installation:


    • Or grab the most current version by following the instructions below.
    • MD5: 45fd49ea2ebff794fc8b9556d4cde796
    • SHA: af4484ec231710368455ad18644ce3b0c28c7c85
  • Or get it from the Bitbucket page: hg clone

  • python install or python install (should work out of the box on Linux or Windows; see below for MacOS X or Windows 64.)

  • running the tests: py.test c/ _cffi1/ testing/ (if you didn’t install cffi yet, you may need python build_ext -f -i)


Platform-specific instructions

libffi is notoriously messy to install and use — to the point that CPython includes its own copy to avoid relying on external packages. CFFI does the same for Windows, but not for other platforms (which should have their own working libffi’s). Modern Linuxes work out of the box thanks to pkg-config. Here are some (user-supplied) instructions for other platforms.


Homebrew (Thanks David Griffin for this)

  1. Install homebrew:
  2. Run the following commands in a terminal
brew install pkg-config libffi
PKG_CONFIG_PATH=/usr/local/opt/libffi/lib/pkgconfig pip install cffi

Aternatively, on OS/X 10.6 (Thanks Juraj Sukop for this)

For building libffi you can use the default install path, but then, in you need to change:

include_dirs = []


include_dirs = ['/usr/local/lib/libffi-3.0.11/include']

Then running python build complains about “fatal error: error writing to -: Broken pipe”, which can be fixed by running:

ARCHFLAGS="-arch i386 -arch x86_64" python build

as described here.

Windows (regular 32-bit)

Win32 works and is tested at least each official release.

The recommended C compiler compatible with Python 2.7 is this one:

For Python 3.4 and beyond:

Windows 64

Win64 received very basic testing and we applied a few essential fixes in cffi 0.7. Please report any other issue.

Note as usual that this is only about running the 64-bit version of Python on the 64-bit OS. If you’re running the 32-bit version (the common case apparently), then you’re running Win32 as far as we’re concerned.