You are not showing the complete console output so I can't know if we are seen the actual root cause of your problem but from what I can see you are missing Xcode in your system (not in R) and the recommended development tools for macOS systems.
https://cran.r-project.org/bin/macosx/tools/
These tools are required to compile packages from source and since you are using a very old R version, you are forced to install packages this way.
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