1. Download asio-1.21.1, download address http://think-async.com/Asio
2. Decompression
3, the command line index to the asio directory
4. Execute ./configure --prefix= "Where you want to store the asio source code" --without-boost
5. Execute make
6. Execute make install
7. Open the project in xcode and add the asio folder
8、Build Settings->Other C++ Flags 添加 -DASIO_STANDALONE -DASIO_SEPARATE_COMPILATION
9. Build Settings->Header Search Paths Add asio path (path to inlcude folder)
10. Build Settings->Library Search Paths Add asio path (path to inlcude folder)
11. After compiling, start to read the documentation and travel