Error while typing " install.packages("httr") "

Hi!

It seems like you are using Windows, and probably are trying to install these pkgs from source (not binaries).

You need a compiler bundled in Rtools, as the message point out. It is likely that you haven't installed Rtools yet. To do so, you can follow the steps detailed here. Pay special attention to setting the PATH correctly (it is a common pitfall)!


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