From 0cff8630295e94be74ec7881d5e4cd7a9aab6f90 Mon Sep 17 00:00:00 2001
From: liuruilong <liuruilong@baidu.com>
Date: Wed, 11 Jul 2018 14:29:08 +0800
Subject: [PATCH] update development doc

---
 doc/development_doc.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/development_doc.md b/doc/development_doc.md
index 18a1974576..dad9a61afb 100644
--- a/doc/development_doc.md
+++ b/doc/development_doc.md
@@ -18,6 +18,12 @@ sh build.sh ios googlenet
 cd ../build/release/ios/build
 
 ```
+#### 常见问题:
+
+1. No iOS SDK's found in default search path ...
+
+    这个问题是因为 tools/ios-cmake/ios.toolchain.cmake 找不到你的最近使用的 iOS SDK 路径, 所以需要自己进行指定, 
+    以我当前的环境为例: 在 tools/ios-cmake/ios.toolchain.cmake 143行前添加我本地的 iOS SDK 路径: set(CMAKE_IOS_SDK_ROOT "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk")
 
 ## 集成
 
-- 
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