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...ot in this directory I get the well-known issue Warning: invalid package ?pkg/? Error: ERROR: no packages specified Instead, calling R CMD INSTALL from ~/Library/R/R-gcc works fine. I checked the permissions on ~/Library/R/R-gcc in R. These seem to be fine to me: system("ls -hFGlxo /Users/simonzehnder/Library/R/R-gcc") total 0 drwxr-xr-x 7 simonzehnder 238B Nov 8 10:37 library/ R CMD INSTALL seems to need a working directory that equals the actual working directory. Is there a workaround, that makes things work for me? Best Simon