Installing R on Mac – Warning messages: Setting LC_CTYPE failed, using “C”

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  1. Open Terminal
  2. Write or paste in: defaults write org.R-project.R force.LANG en_US.UTF-8
  3. Close Terminal (including any RStudio window)
  4. Start R

For someone runs R in a docker environment (under root), try to run R with below command,

LC_ALL=C.UTF-8 R
# instead of just `R`

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