[R-SIG-Mac] svn update > "xcrun: error: invalid active developer path" after uipgrade to 10.11 El Capitan

[Spencer Graves]

Hello:


       I'm having a problem with "svn update" (with R-Forge) that may be 
due to a recent upgrade to OS X 10.11 El Capitan.  I'm getting the 
following:


$ svn update
xcrun: error: invalid active developer path 
(/Library/Developer/CommandLineTools), missing xcrun at: 
/Library/Developer/CommandLineTools/usr/bin/xcrun


       Google sent me to 
"http://stackoverflow.com/questions/28706428/invalid-active-developer-path-on-mac-os-x-after-installing-ruby" 
and "https://github.com/Homebrew/homebrew/issues/23500" for ruby and 
git.  Stackoverflow seems to suggest that "sudo xcode-select --install" 
may fix the problem.  However, I know so little about this, I felt a 
need to ask here.


       What do you think?
       Thanks,
       Spencer