R CMD check error missing recommended package KernSmooth

devtools::run_examples() works fine, but I get the following error with R CMD check:

Error in grDevices:::.smoothScatterCalcDensity(x, nbin, bandwidth) :
Must have the ('Recommended') package "KernSmooth" installed

I am using SmoothScatter()

Running R 4.1.0 on Windows 10., RStudio Version 1.4.1717.

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