Windows中缺少Rtools35 gcc.exe

Question

仅安装Rtools35并具有管理员权限，并选中所有选项：

并运行：

> Sys.which("ls.exe")
                   ls.exe 
"C:\\Rtools\\bin\\ls.exe"
> Sys.which("gcc.exe")
gcc.exe 
     "" 

我还手动查看了'C：\ Rtools \ bin \'，发现gcc.exe丢失了。无法生成软件包。

尝试使用installr。

library(installr)
> install.rtools()
Loading required namespace: devtools
No need to install Rtools - You've got the relevant version of Rtools installed

另外，请确保已卸载，重新启动并重新安装。

> sessionInfo()
R version 3.5.0 (2018-04-23)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Matrix products: default

locale:
[1] LC_COLLATE=English_United Kingdom.1252 
[2] LC_CTYPE=English_United Kingdom.1252   
[3] LC_MONETARY=English_United Kingdom.1252
[4] LC_NUMERIC=C                           
[5] LC_TIME=English_United Kingdom.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
[1] compiler_3.5.0 tools_3.5.0    yaml_2.1.19