r - 安装 github 项目的错误信息

Question

我正在尝试使用从 github 安装 ggmap 最新版本包

devtools::install_git（“dkahle/ggmap”），它向我显示了这个错误。谁能帮我吗？谢谢

Downloading git repo dkahle/ggmap
Error in git2r::clone(x$url, bundle, credentials = x$credentials, progress = FALSE) : 
  Error in 'git2r_clone': unsupported URL protocol
In addition: Warning message:
In git2r::remote_ls(remote$url, credentials = remote$credentials) :
  Error in 'git2r_remote_ls': unsupported URL protocol

标签： rerror-handlinginstallationgitlab