From cec1254a35bce38f8f5ca6de28aa055e2f1818e7 Mon Sep 17 00:00:00 2001
From: IWASE Yusuke <iwase.yusuke0@gmail.com>
Date: Tue, 13 Jun 2017 16:24:30 +0900
Subject: [PATCH] README: Dependencies for installing optional requirements

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
 README.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/README.rst b/README.rst
index 60342174..1a54ae7c 100644
--- a/README.rst
+++ b/README.rst
@@ -47,6 +47,16 @@ If you want to use the functionalities, please install requirements::
 Please refer to tools/optional-requires for details.
 
 
+Prerequisites
+=============
+If you got some error messages at installation step, please confirm
+dependencies for building required Python packages.
+
+On Ubuntu(16.04 LTS or later)::
+
+  % apt install gcc python-dev libffi-dev libssl-dev libxml2-dev libxslt1-dev zlib1g-dev
+
+
 Support
 =======
 Ryu Official site is `<http://osrg.github.io/ryu/>`_.