今天在编译eos源码的时候一直报如下错误。

fatal: destination path 'mongo-cxx-driver' already exists and is not an empty directory.

    Unable to clone MongoDB C++ driver at this time.

    Exiting now.

    我猜想可能跟我通过brew手动安装了一些库有关，因而我尝试清除掉所有brew已经安装的软件来解决这个问题，具体操作如下：

删除brew库

cd `brew --prefix`

$ rm -rf Cellar

$ brew prune

$ rm -rf Library .git .gitignore bin/brew README.md share/man/man1/brew

$ rm -rf ~/Library/Caches/Homebrew

重装brew

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

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