To_install <- unname(installed.packages(lib. lib_loc <- "C:/Users/apdev/Documents/R/win-library/3.3" Here is a script that will install the old libraries. Starting with R 4.0.0 (released April 2020), R for Windows uses a toolchain bundle called rtools4.This version of Rtools is based on msys2, which makes easier to build and maintain R itself as well as the system libraries needed by R packages on Windows. If you go to Documents\R\win-library there will be a version folder with the libraries installed inside. The second part with packages not being found has to do with upgrading the R version e.g. Now restart R, and verify that make can be found, which should show the path to your Rtools installation. Renviron in your Documents folder which contains the following line: writeLines('PATH="$"', con = "~/.Renviron") The easiest way to do so is create a text file. Either a visible TRUE if rtools is found, or an invisible FALSE with a diagnostic message.As a side-effect the internal package variable rtoolspath is updated to the paths to rtools binaries. The easiest way to do so is create a text file. After installation is complete, you need to perform one more step to be able to compile R packages: you need to put the location of the Rtools make utilities (bash, make, etc) on the PATH. After installation is complete, you need to perform one more step to be able to compile R packages: you need to put the location of the Rtools make utilities (bash, make, etc) on the PATH.
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