Hello Andreas, I see the error within r-cran-prophet's build.
It seems like this issue stems from r-cran-rstan (as the call stack shows). Specifically: $ grep -r "system.file(\"lib\"" R/plugin.R: RcppParallel_pkg_libs <- system.file("lib", .Platform$r_arch, R/plugin.R: rstan_StanServices <- system.file("lib", .Platform$r_arch, "libStanServices.a", I believe the first line (regarding RcppParallel_pkg_libs) is of concern and the cause as again, the library location assumption is wrong. I will write a patch for this too, and I'll test anymore findings. Kind regards, Shayan Doust
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