我正在尝试更新已安装的软件包，如果相关的话，其中之一是pkgconfig。我一直在尝试更新程序包，但它不断重启，没有止境。它给了我这个：
> install.packages("pkgconfig")
Error in install.packages : Updating loaded packages
我尝试安装新的软件包，但这给了我这个错误：
Package gridtext has compiled code, but no suitable compiler(s) were found. Installation will likely fail.
Install Rtools (https://cran.r-project.org/bin/windows/Rtools/).Then use the pkgbuild package, or make sure that Rtools in the PATH.
我该怎么办？