Warnmeldung:
In doTryCatch(return(expr), name, parentenv, handler) :
kann shared object '/Library/Frameworks/R.framework/Resources/modules//R_X11.so' nicht laden:
dlopen(/Library/Frameworks/R.framework/Resources/modules//R_X11.so, 6): Library not loaded: /opt/X11/lib/libSM.6.dylib
Referenced from: /Library/Frameworks/R.framework/Versions/3.6/Resources/modules/R_X11.so
Reason: image not found
Under OS X
install.packages(c("ggplot2","dplyr","readr","optparse", "cowplot", "nls2"))
fails, due to missing X11.