Error in installing rstan 2.19.3

Hi all, When I tried to install rstan 2.19.3 with R version 4.0.2, I got this error message.
Please explain me why this happens? Because, I was able to install rstan with my other laptop without any error.

Installing package into ‘C:/Users/Erandi/Documents/R/win-library/4.0’
(as ‘lib’ is unspecified)

  • installing source package ‘rstan’ …
    ** package ‘rstan’ successfully unpacked and MD5 sums checked
    ** using staged installation
    ** libs

*** arch - i386
Warning in system(cmd) : ‘make’ not found
ERROR: compilation failed for package ‘rstan’

  • removing ‘C:/Users/Erandi/Documents/R/win-library/4.0/rstan’
    Warning in install.packages :
    installation of package ‘C:/Users/Erandi/Downloads/rstan_2.19.3.tar.gz’ had non-zero exit status


RTools35 is not installed or recognized. What does

pkgbuild::has_build_tools(debug = TRUE)

say? But I wouldn’t stick with 2.19.x anyway.