No rsvg-convert executable is provied for OSX; provided you opt for internal svg->PDF conversion (the default),
this ought not to be a problem.

The following  text (taken from the abcplus OSX bundle) refers to the excutables in the 'bin' subdirectory:
-------------------
These programs are:

abcMIDI-20200212
abcm2ps-8.14.6 (no Pango support)
abcpp-1.4.5
abc2prt-1.0.2
