mac上brew以及essentia安装

essentia最简单的安装方式是采用brew进行安装，首先

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

2.设置环境变量
vim .bash_profile
在里面添加
export PATH=/usr/local/bin:/usr/local/sbin:$PATH

brew安装完成后，接着安装essentia

brew tap MTG/essentia
brew install essentia --HEAD
brew install essentia --HEAD --with-gaia