Recompiled R 4.0.3 to not use X11 and to use cairo and now png() works without an X11 error and without a shadow graphics error

Please refer to previous post: Switched from Buster to Ubuntu Server Bionic Beaver and compiled RStudio Server and it all works except for plots, need type=’cairo’ and or xvfb-run
Recompiled R 4.0.3 to not use X11 and to use cairo and now png() works without an X11 error and without a “shadow device graphics error”. Here’s the configure command which I discovered from straychild01’s comment on Setting up your own shiny-server / rstudio-server on a Raspberry Pi 3B+ on the R Studio Community Forum

./configure --with-x=no --with-cairo=yes --with-libpng=yes --enable-R-shlib`