启动gogs报错，提示找不到git

2019/05/09 14:43:25 [T] Custom path: /home/git
/gogs/custom
2019/05/09 14:43:25 [T] Log path: /home/git/gogs/log
2019/05/09 14:43:25 [I] Gogs: Go Git Service 0.8.25.0129
2019/05/09 14:43:25 [I] Log Mode: File(Info)
2019/05/09 14:43:25 [I] Cache Service Enabled
2019/05/09 14:43:25 [I] Session Service Enabled
2019/05/09 14:43:25 [I] Mail Service Enabled
2019/05/09 14:43:25 [I] Notify Mail Service Enabled
2019/05/09 14:43:25 [.../gogs/models/repo.go:97 NewRepoContext()] [E] Fail to test 'git' command: exec: "git": executable file not found in $PATH (forgotten install?)

本机，没安装git服务 。

安装，见文章http://istester.com/article/118.html