From de00052be7a1eee60732fc654e12823d67a99d7f Mon Sep 17 00:00:00 2001
From: Feng Xiao <xfxyjwf@gmail.com>
Date: Thu, 28 Aug 2014 11:18:51 -0700
Subject: Add instructions on how to generate the configure script.

---
 README.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/README.txt b/README.txt
index 0180d1e6..cbfdba74 100644
--- a/README.txt
+++ b/README.txt
@@ -5,6 +5,18 @@ https://developers.google.com/protocol-buffers/
 C++ Installation - Unix
 =======================
 
+If you get the source from github, you need to generate the configure script
+first:
+
+  $ ./autogen.sh
+
+This will download gtest source (which is used for C++ Protocol Buffer
+unit-tests) to the current directory and run automake, autoconf, etc.
+to generate the configure script and various template makefiles.
+
+You can skip this step if you are using a release package (which already
+contains gtest and the configure script).
+
 To build and install the C++ Protocol Buffer runtime and the Protocol
 Buffer compiler (protoc) execute the following:
 
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