[pypy-commit] pypy default: document cffi as a build-time requirement

[rlamy]

Author: Ronan Lamy <ronan.lamy at gmail.com>
Branch: 
Changeset: r89847:31ec34667797
Date: 2017-01-30 17:34 +0000
http://bitbucket.org/pypy/pypy/changeset/31ec34667797/

Log:	document cffi as a build-time requirement

diff --git a/pypy/doc/build.rst b/pypy/doc/build.rst
--- a/pypy/doc/build.rst
+++ b/pypy/doc/build.rst
@@ -56,6 +56,9 @@
 .. _`arm document`: http://rpython.readthedocs.org/en/latest/arm.html
 .. _`RPython documentation`: http://rpython.readthedocs.org
 
+The host Python needs to have CFFI installed. If translating on PyPy, CFFI is
+already installed. If translating on CPython, you need to install it, e.g. 
+using ``pip install cffi``.
 
 To build PyPy on Unix using the C translation backend, you need at least a C
 compiler and ``make`` installed. Further, some optional modules have additional