如何在Mac OS X Lion中安装gcc

我是Mac OS的新手.我有一个Mac书本专业版.我正在Mac中寻找gcc.我已经安装了XCode.因此，C ++库已经随XCode一起安装.但是，我不能从XCode外部使用它.我想在Eclipse中使用c ++库.如果我已经有了XCode，我不知道如何使用eclipse进行配置或如何安装gcc?我应该使用其他图书馆吗?

I am new in mac os. I have one Mac book pro. I am looking for gcc in my Mac. I already install XCode. So, C++ library already installed with XCode. But, I can not use it from outside XCode. I want to use c++ library with Eclipse. I do not know how to configure it with eclipse or how to install gcc, if I already have XCode? Should I use any other library?

提示:

当我在终端中编写以下命令时，它会显示错误.

When I write following command in my terminal it shows an error.

$ gcc -v
-bash: gcc: command not found
$

谢谢.