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### Running command:
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###   /Library/Frameworks/R.framework/Versions/Current/Resources/bin/R CMD INSTALL xps
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* installing to library ‘/Library/Frameworks/R.framework/Versions/4.0/Resources/library’
* installing *source* package ‘xps’ ...
** using staged installation
checking for gcc... clang -mmacosx-version-min=10.13
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether clang -mmacosx-version-min=10.13 accepts -g... yes
checking for clang -mmacosx-version-min=10.13 option to accept ANSI C... none needed
checking how to run the C preprocessor... clang -mmacosx-version-min=10.13 -E
checking for gcc... (cached) clang -mmacosx-version-min=10.13
checking whether we are using the GNU C compiler... (cached) yes
checking whether clang -mmacosx-version-min=10.13 accepts -g... (cached) yes
checking for clang -mmacosx-version-min=10.13 option to accept ANSI C... (cached) none needed
checking for root-config... no

xps configuration error:

   You must set the shell variable ROOTSYS to the
   directory where ROOT resides and re-run R CMD INSTALL
   e.g., (using Bourne shell syntax):

      export ROOTSYS=/opt/root
      export "PATH=$ROOTSYS/bin:$PATH" 
      R CMD INSTALL xps

   Please consult the README file for more information

ERROR: configuration failed for package ‘xps’
* removing ‘/Library/Frameworks/R.framework/Versions/4.0/Resources/library/xps’