git如何merge github forked repository里的代码更新?

[refer to ]http://www.haojii.com/2011/08/how-to-git-merge-from-forked-repository/]

问题是这样的,github里有个项目ruby-gmail,我需要从fork自同一个项目的另一个repository拿一些Bug Fix的代码
link1:https://github.com/dcparker/ruby-gmail (原作者dcparker的repository)
link2:https://github.com/jihao/ruby-gmail (我从link1 fork的repository)
link3:https://github.com/geoffyoungs/ruby-gmail (geoffyoungs 从link1 fork的repository,然后他有些Bug修改,但是没被merge回原作者的link1的repository)

也就我git clone repository到本地后,发现link3有我想要的代码,我要把link3上的改动merge到我的repository上,避免我花精力改相同的bug

git如何merge github forked repository里的更新?
具体做法是下面三步,以前没用git这么搞过,知道之后其实蛮简单
1. >git remote add geoffyoungs http://github.com/geoffyoungs/ruby-gmail.git
2. >git fetch geoffyoungs
3. >git merge geoffyoungs/master

本地的repository看上去是这样的:
>git remote -v
geoffyoungs http://github.com/geoffyoungs/ruby-gmail.git (fetch)
geoffyoungs http://github.com/geoffyoungs/ruby-gmail.git (push)
origin http://[email protected]/jihao/ruby-gmail.git (fetch)
origin http://[email protected]/jihao/ruby-gmail.git (push)
>git branch -a
* master
remotes/geoffyoungs/gh-pages
remotes/geoffyoungs/master
remotes/origin/HEAD -> origin/master
remotes/origin/adimircolen-master
remotes/origin/gh-pages
remotes/origin/master

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