bower安装bootstrap

我用bower安装boostrap时出现错误如下 "level": "error", "message": "git is not installed or not in the PATH", "stacktrace": "Error: git is not installed or not in the PATH\n at createEr ror (C:\Users\Administrator\AppData\Roaming\npm\node_modules\bower\lib\ util\createError.js:4:15)\n

说是没有安装git 请问各位是要安装git吗