MAC系统升级到10.15.1后homebrew不能正常使用的问题

新的系统更新后对一些重要目录的权限进行了限制，原先安装的homebrew可能会出现一些问题

Warning: Your Homebrew is outdated. You haven't updated for at least 24 hours. This is a long time in brewland! To update Homebrew, run `brew update`. brew update

brew 被删除了

那我只有重新安装brew了

首先进入https://brew.sh

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Installation successful!

brew doctor

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:

 pkg-config

 putty

 libpng

 freetype

 composer

 unixodbc

 autoconf

 php55-intl

 jpeg

 php55

Warning: Homebrew's sbin was not found in your PATH but you have installed

formulae that put executables in /usr/local/sbin.

Consider setting the PATH for example like so:

 echo 'export PATH="/usr/local/sbin:$PATH"' >> ~/.bash_profile

brew link pkg-config
echo 'export PATH="/usr/local/sbin:$PATH"' >> ~/.bash_profile
source ~/.bash_profile