From a2173bc908c475593a3f4a597443cea8bc66fb10 Mon Sep 17 00:00:00 2001
From: Xin Zhang <xinzweb@users.noreply.github.com>
Date: Fri, 29 Jan 2016 05:10:24 -0800
Subject: [PATCH] Update README.md

---
 README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/README.md b/README.md
index d36b5e7162..bbc2d9517f 100644
--- a/README.md
+++ b/README.md
@@ -107,6 +107,9 @@ throughout the codebase, but a few larger additions worth noting:
 ## Build GPDB with Planner
 
 ```
+# Clean environment
+make distclean
+
 # Configure build environment to install at /usr/local/gpdb
 ./configure --prefix=/usr/local/gpdb
 
@@ -127,6 +130,9 @@ source gpdemo-env.sh
 ## Build GPDB with GPORCA
 
 ```
+# Clean environment
+make distclean
+
 # Configure build environment to install at /usr/local/gpdb
 ./configure --enable-orca --with-perl --with-python --with-libxml --prefix=/usr/local/gpdb
 
-- 
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