brew 安装个软件，没装成功却开始报这个错了：
Already up-to-date.
Error: Calling needs :cxx11 is disabled! There is no replacement.
Please report this to the chrisdeeming/legacyphp
tap: /usr/local/Homebrew/Library/Taps/chrisdeeming/homebrew-legacyphp/Formula/php@7.0.rb:41
我晕。现在都7.2了，这个源还报错？看了下官网。原来这个源不再需要:needcxx11了。OK，官网说重新brew update一下就好了。
重新brew update。恢复正常
1、https://github.com/chrisdeeming/homebrew-legacyphp/pull/4
2、https://github.com/chrisdeeming/homebrew-legacyphp/issues/2
#1