关于Rstudio内安装RGtk2报错的问题

> install.packages("D:/360安全浏览器下载/RGtk2_2.20.31.tar.gz", repos = NULL, type = "source")
Installing package into ‘C:/Users/mi/Documents/R/win-library/3.5’
(as ‘lib’ is unspecified)
* installing *source* package 'RGtk2' ...
** 成功将'RGtk2'程序包解包并MD5和检查
Warning in system("sh ./configure.win") : 'sh' not found
ERROR: configuration failed for package 'RGtk2'
* removing 'C:/Users/mi/Documents/R/win-library/3.5/RGtk2'
In R CMD INSTALL
Warning in install.packages :
installation of package ‘D:/360安全浏览器下载/RGtk2_2.20.31.tar.gz’ had non-zero exit status
大概如上，新人不知道该怎么解决，求帮助！！