I have updated BBC BASIC for SDL 2.0 from version 1.41a to version 1.41b to fix the dlglib combobox bug (affecting only 64-bit editions).
I have also added Unifont.otf. This font isn't pretty but it has good coverage of the Basic Multilingual Plane so may be useful if you need glyphs not in the other supplied fonts (e.g. Chinese).