[R] Issue with installing RExcel

[bjbreitling]

Hi community.  I'm fairly new to R and have a basic question.  When I try to
install RExcel with the code:
install.packages("RExcelInstaller", "rcom", "rsproxy") 
I get the message below:
Warning in install.packages("RExcelInstaller", "rcom", "rsproxy") :
  'lib = "rcom"' is not writable
Error in install.packages("RExcelInstaller", "rcom", "rsproxy") : 
  unable to install packages
How do I make the rcom folder writable?

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