Problem installing packages on r 3.5.1 running on mac (OS X 10.13 Sierra)

Hi @Berta!

The attempt to install data.table failed due to a problem compiling the package from source. Before trying to fix that, though, you might try installing the binary (already compiled) version that's available — it's not that much older than the source version. To try this, run:

install.packages("data.table", type = "binary")

Then see if you can load Rcmdr. Does that work?

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