How to use .a in XCode?

FROM : dexter morgan
DATE : Wed Jun 25 22:43:05 2008

Hello guys,
I need to use id3lib inside my xcode project.
Basically it's a Cocoa app with some c/c++ source files.
At this time I would simply get it compiled.

I've downloaded id3lib and now it's under /usr/local/include/id3 (some
headers), /usr/local/lib (libraries .a) and finally
/usr/local/include/bin (I think I'll not need of this last folder).

In my source code I've following imports:

#include <id3/id3lib_streams.h>
#include <id3/tag.h>
#include <id3/misc_support.h>

is id3 the folder inside /usr/local/include?
How can I import these libreries into the project? (I would to copy
these files into app package in order to allow app launch even if you
have not installed id3lib in /usr/local.

TIA