Fixing export_fig font issues (Matlab figure export)

export_fig is a terrific Matlab File Exchange contribution that streamlines high quality figure export (e.g. to EPS, PDF etc) from Matlab.

Under mac 10.12.6, Matlab 2018a, I had issues with the export breaking, particularly in terms of font embedding.

It was also helpful to install Brew and (reinstall) xpdf, and to follow suggestions made in this useful thread: Hidden failure mode for pdftops when outputting to eps [GitHub]