brew install/update過程當中download failed的問題及解決方法

今天由於要在mac上安裝caffe，須要先安裝opencv，因而使用命令brew install opencv進行安裝。結果出現如下錯誤： curl: (7) Failed to connect to gist.github.com port 443: Operation timed outgit Error: Failed to download resource "mpfr--patch"gi

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