[R-SIG-Mac] rgl in R version 4.1.1 Patched (2021-08-13 r80752)

[Richard M. Heiberger]

 R version 4.1.1 Patched (2021-08-13 r80752)
 aarch64-apple-darwin20        

> library(rgl)
Error in dyn.load(dynlib <- getDynlib(dir)) : 
  unable to load shared object '/Library/Frameworks/R.framework/Versions/4.1-arm64/Resources/library/rgl/libs/rgl.so':
  dlopen(/Library/Frameworks/R.framework/Versions/4.1-arm64/Resources/library/rgl/libs/rgl.so, 6): Symbol not found: _hb_buffer_add_utf8
  Referenced from: /Library/Frameworks/R.framework/Versions/4.1-arm64/Resources/library/rgl/libs/rgl.so
  Expected in: flat namespace
 in /Library/Frameworks/R.framework/Versions/4.1-arm64/Resources/library/rgl/libs/rgl.so