title: Where is my "stdio.h" in Mac?
body: <p>I know that Mac OS X is a Unix-based system. And I heard that C standard library such as stdio.h, is located in <code>/usr/local/include</code> or <code>/usr/include</code>. But there is not any kind of library in this directory. I use Terminal to search this directory and I also use command like <code>find ./ -iname "stdio.h"</code>, but nothing comes out. However, strangely enough, <code>gcc -test.c -o test</code> command works out. How did it happen? I want to know where my C library is located.
  p.s I also use Xcode, too. Is it related with this application? help me!
      And I have AWS EC2 linux server, and it has both libraries that i refereed above.</p>