* libffi (you need ``libffi-dev``); the Windows version is included with CFFI.
+* a C compiler is required to use CFFI during development, but not to run
+ correctly-installed programs that use CFFI.
Download and Installation:
* or you can directly import and use ``cffi``, but if you don't
compile the ``_cffi_backend`` extension module, it will fall back
- to using internally ``ctypes`` (slower and does not support
+ to using internally ``ctypes`` (much slower and does not support
+ ``verify()``; we recommend not to use it).