使用brew 软件安装 node.js 时遇到问题

我正在try 安装Node.js与Homebrew(我以前安装它时没有使用brew，我try 过删除所有这些文件).我看过以前的问题，问了类似的问题，但我没能让它们起作用.首先我试了brew link node次，结果是:

myusername@c126h060:~$ brew link node
Linking /usr/local/Cellar/node/0.12.6... 
Error: Could not symlink share/systemtap/tapset/node.stp
Target /usr/local/share/systemtap/tapset/node.stp
already exists. You may want to remove it:
  rm '/usr/local/share/systemtap/tapset/node.stp'

To force the link and overwrite all conflicting files:
  brew link --overwrite node

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

然后当我跑brew link --overwrite node的时候，我会得到以下结果:

myusername@c126h060:~$ brew link --overwrite node
Linking /usr/local/Cellar/node/0.12.6... 
Error: Could not symlink share/systemtap/tapset/node.stp
/usr/local/share/systemtap/tapset is not writable.

此外，当我try 使用brew link -n node来查找要手动删除的文件时，我成功地删除了其中一些文件，但我仍然保留了以下无法删除的文件:

myusername@c126h060:~$ brew link -n node
Would link:
/usr/local/etc/bash_completion.d/npm
/usr/local/bin/node
/usr/local/include/node
/usr/local/share/man/man1/node.1
/usr/local/share/systemtap/tapset/node.stp
/usr/local/lib/dtrace/node.d

当我try 删除时，我会得到以下结果(所有这些文件都是一样的):

myusername@c126h060:~$ rm /usr/local/etc/bash_completion.d/npm
rm: /usr/local/etc/bash_completion.d/npm: No such file or directory

我该怎么办？