使用自制程序问题安装Node.js.

我正在尝试在OS X上安装带有自制程序的Node.js,但是我遇到了一些问题而且我不太确定如何修复它们.当我运行时,brew doctor我得到以下输出:

Warning: Python is installed at /Library/Frameworks/Python.framework

Homebrew only supports building against the System-provided Python or a
brewed Python. In particular, Pythons installed to /Library can interfere
with other software installs.

Warning: You have unlinked kegs in your Cellar
Leaving kegs unlinked can lead to build-trouble and cause brews that depend on
those kegs to fail to run properly once built. Run `brew link` on these:

    node

Warning: You have uncommitted modifications to Homebrew
If this a surprise to you, then you should stash these modifications.
Stashing returns Homebrew to a pristine state but can be undone
should you later need to do so for some reason.
    cd /usr/local/Library && git stash && git clean -d -f
Error: Homebrew doesn't know what compiler versions ship with your version
of Xcode (5.1). Please `brew update` and if that doesn't help, file
an issue with the output of `brew --config`:
  https://github.com/Homebrew/homebrew/issues

Note that we only track stable, released versions of Xcode.

Thanks!

我试图运行brew link node并收到以下消息:

Linking /usr/local/Cellar/node/0.10.26... Warning: Could not link node. Unlinking...

Error: Could not symlink file: /usr/local/Cellar/node/0.10.26/lib/dtrace/node.d
Target /usr/local/lib/dtrace/node.d already exists. You may need to delete it.
To force the link and overwrite all other conflicting files, do:
  brew link --overwrite formula_name

To list all files that would be deleted:
  brew link --overwrite --dry-run formula_name

所以然后我试着运行brew link --overwrite node并得到以下错误:

Linking /usr/local/Cellar/node/0.10.26... Warning: Could not link node. Unlinking...

Error: Permission denied - /usr/local/lib/dtrace/node.d

我现在卡住了,不知道该怎么做.任何帮助将不胜感激.