From 3f187c3334c8b2f648d24f3ea090225b1a0309ea Mon Sep 17 00:00:00 2001
From: Liu Yiqun <liuyiqun01@baidu.com>
Date: Wed, 29 Mar 2017 12:17:43 +0800
Subject: [PATCH] Fix cmake broken when using lower version.

---
 cmake/flags.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/flags.cmake b/cmake/flags.cmake
index d8a38890338..7eb92efcb00 100644
--- a/cmake/flags.cmake
+++ b/cmake/flags.cmake
@@ -26,7 +26,7 @@ function(CheckCompilerCXX11Flag)
 endfunction()
 
 CheckCompilerCXX11Flag()
-string(APPEND CMAKE_CXX_FLAGS " -std=c++11")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 
 # safe_set_flag
 #
-- 
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