Error message Eigen not found

rstan (Version 2.19.3, GitRev: 2e1f913d3ca3)

R version 3.6.1 (2019-07-05) – “Action of the Toes”
Copyright © 2019 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64 (64-bit)

OS is Windows 10 Enterprise
Version 1909 / OS build 18363.752

Warning message:
package ‘RcppEigen’ was built under R version 3.6.3

I run the QR decomposition example from the Stan site on my Mac laptop and it runs without a problem. I do get the warning message about the Jacobian they say will happen.

I run the same code and data on a Windows desktop and get the error message that Eigen can’t be found:

qr_fit <- stan(file=‘qr_regr.stan’, data=input_data, seed=483892929)
Left-hand side of sampling statement (~) may contain a non-linear transform of a parameter or local variable.
If it does, you need to include a target += statement with the log absolute determinant of the Jacobian of the transform.
Left-hand-side of sampling statement:
beta ~ normal(…)

Error in stan_model(file, model_name = model_name, model_code = model_code, :
Eigen not found; call install.packages(‘RcppEigen’)

thanks for any help

Nevermind - it was our security software protecting me from Stan
sorry for this

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