爲什麼我的所有自制軟件包突然「斷開連接」;我該如何解決這個問題？

Question

最近brew doctor或brew upgrade --all（我不知道它，我在腳本中運行它們）報告如下：

Homebrew from 5371359 to e3fe270. 
Updated 3 taps (caskroom/cask, homebrew/boneyard, homebrew/core). 
Error: Could not symlink bin/dvipdf 
Target /usr/local/bin/dvipdf 
already exists. You may want to remove it: 
    rm '/usr/local/bin/dvipdf' 

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

To list all files that would be deleted: 
    brew link --overwrite --dry-run ghostscript 
Error: Could not symlink bin/easy_install 
Target /usr/local/bin/easy_install 
already exists. You may want to remove it: 
    rm '/usr/local/bin/easy_install' 

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

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

我通過運行遵循這些說明：

brew link --overwrite python 
brew link --overwrite ghostscript 

但現在每當我運行brew doctor得到：

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: 
    # A list of EVERYTHING listed by brew list 

即：brew doctor現在顯示我已經安裝的所有東西 - 所有東西都列在brew list之間，因爲它們之間沒有任何聯繫！

這是怎麼回事？爲什麼我使用Homebrew安裝的所有東西都突然斷開？他們是怎麼得到這種方式的？我能（安全）做些什麼來解決我的家釀安裝（除了個別在我安裝的每一件事情？

Answer 1

運行brew update手動運行brew link --overwrite ...（如果有必要的兩倍）應排序了這一點。

如果不是， brew unlink $(brew list); brew link $(brew list)意願。