记Flutter 安装报错：Error: The Flutter directory is not a clone of the GitHub project flutter

记Flutter 安装报错：Error: The Flutter directory is not a clone of the GitHub project flutter

1.我是直接从官网下载最新版本 stable 的 Flutter SDK ，解压后存放在c:/src 下，
然后执行flutter doctor 后有如下报错：

Error: The Flutter directory is not a clone of the GitHub project.
   The flutter tool requires Git in order to operate properly;
   to set up Flutter, run the following command:
   git clone -b beta https://github.com/flutter/flutter.git

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2.是由于未检测到.git文件引起，然后于是在c:/src/flutter 目录下执行 git init 提示如下：

Reinitialized existing Git repository in C:/src/flutter/.git/

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3.这说明目录下已经存在了.git文件，原来是系统默认隐藏了，然后点击查看->勾选隐藏，.git文件就可以查看了

4.接下来我们重新执行 flutter doctor,就可以正常运行了，静静的等待就ok.