Thanks everyone for the support, ideas and pointers in the right directions. I'm now successfully installing packages with dependencies using the GUI. Downloading the command line tools in Xcode was the key, I believe. 

Best wishes

Ross

Dr Ross Tinsley 
Head of Research | Editor IHTSJ
International Hospitality and Tourism Research Centre
HTMi | Hotel and Tourism Management Institute | Switzerland
e. rtinsley@htmi.ch | w. htmi.ch | t. +41 (0) 41 488 11



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