I’m normall using Optima Nova on my system, e.g. by defining a font like this:


\definefontfamily
    [archimate]
    [ss]
    [Optima nova LT Pro]
    [tf=style:Medium,
     bf=style:Bold,
     it=style:Medium Italic,
     bi=style:Bold Italic]
\setupbodyfont[archimate]

I would like to experiment with Gill Sans, but that fails with

fonts           > defining > unable to define 'GillSans.ttc' as 'archimate-14pt-ss-tf-0--0'

It is here:

/System/Library/Fonts/Supplemental/GillSans.ttc

What should I do to be able to use that font?