已安装 Homebrew 并已下载 git，但它不会链接。得到这个错误信息：
Consider amending your PATH so that /usr/local/bin
occurs before /usr/bin in your PATH.
Warning: You have a non-Homebrew 'pkg-config' in your PATH:
/opt/sm/pkg/active/bin/pkg-config
`./configure` may have problems finding brew-installed packages using
this other pkg-config.
unknown7cd1c3e98b07:~ pdenlinger$ brew install git
Error: git-1.8.0 already installed, it's just not linked
unknown7cd1c3e98b07:~ pdenlinger$ brew link git
Linking /usr/local/Cellar/git/1.8.0... Warning: Could not link git. Unlinking...
Error: Could not symlink file: /usr/local/Cellar/git/1.8.0/bin/gitk
Target /usr/local/bin/gitk already exists. You may need to delete it.
To force the link and delete this file, do:
brew link --overwrite formula_name
To list all files that would be deleted:
brew link --overwrite --dry-run formula_name
unknown7cd1c3e98b07:~ pdenlinger$ brew link git
我能做些什么来解决这个问题？
vi 命令的响应：
sudo vi /etc/paths /usr/local/bin /usr/local/sbin /usr/bin /bin /usr/sbin /sbin
7 files to edit
E325: ATTENTION
Found a swap file by the name "/etc/.paths.swp"
owned by: root dated: Thu Nov 22 09:10:09 2012
file name: /private/etc/paths
modified: no
user name: root host name: unknown7cd1c3e98b07.att.net
process ID: 98069 (still running)
While opening file "/etc/paths"
dated: Tue Aug 21 15:44:10 2012
(1) Another program may be editing the same file.
If this is the case, be careful not to end up with two
different instances of the same file when making changes.
Quit, or continue with caution.
(2) An edit session for this file crashed.
If this is the case, use ":recover" or "vim -r /etc/paths"
to recover the changes (see ":help recovery").
If you did this already, delete the swap file "/etc/.paths.swp"
to avoid this message.
Swap file "/etc/.paths.swp" already exists!
[O]pen Read-Only, (E)dit anyway, (R)ecover, (Q)uit, (A)bort: