I have a problem with cmdstan
This command check_cmdstan_toolchain(fix = TRUE, quiet = FALSE) gives the following output:
Installing mingw32-make and g++ with Rtools42.
processx::run("pacman", args = c("-Sy", install_pkgs, "--noconfirm"), …:
! System command ‘pacman’ failed
Exit status: 1
error: failed to synchronize all databases (unable to lock database)
Thank you for yout help