From fe33c5fe9de57b010f5b47c5044d895ec813f92a Mon Sep 17 00:00:00 2001
From: Abdul Sami <asami@folio3.com>
Date: Wed, 21 Feb 2018 12:17:55 +0500
Subject: [PATCH] Added instruction for existing ZLIB configuration

Using two configuration flags `DZLIB_INCLUDE_DIR` and `DZLIB_LIB` we can locate an existing ZLIB on the system
---
 cmake/README.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cmake/README.md b/cmake/README.md
index 1e7410d828547..305ebb8846c65 100644
--- a/cmake/README.md
+++ b/cmake/README.md
@@ -302,6 +302,11 @@ further disable the option `-Dprotobuf_MSVC_STATIC_RUNTIME=OFF`.
 If it reports NOTFOUND for zlib_include or zlib_lib, you might haven't put
 the headers or the .lib file in the right directory.
 
+If you already have ZLIB library and headers at some other location on your system then alternatively you can define following configuration flags to locate them:
+
+	-DZLIB_INCLUDE_DIR=<path to dir containing zlib headers>
+	-DZLIB_LIB=<path to dir containing zlib>
+	
 Build and testing protobuf as usual.
 
 Notes on Compiler Warnings