Installing on MAC

I've tried for a few hours to install Shiny on my computer but I keep getting this message once it stops downloading:

  • installing source package ‘fastmap’ ...
    ** package ‘fastmap’ successfully unpacked and MD5 sums checked
    ** using staged installation
    ** libs
    xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
    ERROR: compilation failed for package ‘fastmap’
  • removing ‘/Library/Frameworks/R.framework/Versions/4.0/Resources/library/fastmap’
    Warning in install.packages :
    installation of package ‘fastmap’ had non-zero exit status
    ERROR: dependency ‘fastmap’ is not available for package ‘shiny’
  • removing ‘/Library/Frameworks/R.framework/Versions/4.0/Resources/library/shiny’
    Warning in install.packages :
    installation of package ‘shiny’ had non-zero exit status

For compiling packages from source, you need to install Xcode in your system (not in R) and the recommended development tools for macOS systems.

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Im going to need some more space on my hard drive, but that did it. Thanks so much.