我在macOS Mojave 10.14.2中运行了brew outdated，并确定python和python@2已过时。当我运行brew upgrade时，两者都失败了。例如python@2：
==> Upgrading python@2
==> Downloading https://homebrew.bintray.com/bottles/python@2-2.7.15_2.mojave.bottle.tar.gz
######################################################################## 100.0%
==> Pouring python@2-2.7.15_2.mojave.bottle.tar.gz
Error: An unexpected error occurred during the `brew link` step
The formula built, but is not symlinked into /usr/local
Permission denied @ dir_s_mkdir - /usr/local/Frameworks
Error: Permission denied @ dir_s_mkdir - /usr/local/Frameworks
我运行了brew doctor，建议您运行brew link，但这仍然失败，并出现相同的权限错误：
Linking /usr/local/Cellar/python@2/2.7.15_2... Error: Permission denied @ dir_s_mkdir - /usr/local/Frameworks
This post建议向父目录授予特权，但是我想了解为什么会发生这种情况并找到学习的解决方案。
答案 0 :(得分：0)
我找到了答案here。根据该帖子，我必须先sudo mkdir /usr/local/Frameworks创建丢失的目录，然后再创建sudo chown -R $(whoami) $(brew --prefix)/*，因为sudo chown -R $(whoami) /usr/local在Mojave和High Sierra中不再可用。之后我可以brew link python和brew link python@2。