I meet some trouble when I compile some C code on my mac which give me this error :

**fatal error: 'endian.h'
 file not found**

I did some google search about this problem.It seems like mac os x does not have header files like "endian.h", we have to create this file manually.

Then, I found this <http://www.opensource.apple.com/source/CarbonHeaders/CarbonHeaders-18.1/Endian.h> which might be the file I am looking for but not sure.

But more troubles are coming.. where should I put this file? 

**The file /usr/include does not exist.**

These are the folders in my /usr directory:

**X11 bin libexec share
X11R6 lib sbin standalone**

Could anyone help me to check the correctness of the endian.h file I found and tell me where to put this file in my mac please?