It seems the changes in font.scm were harmful to MacOS X. On
processing, I get:
warning: don't know how to embed "Verdana"="/Library/Fonts/Verdana"
and in the resulting PDF file, the chord names look weird (I believe
it's Verdana substituted with Courier).
This seems to be related with pango default font lookup, which I don't
understand very well, and with the fact that native fonts don't seem to
be handled well by the open source tool chain.
Any suggestions how I could fix this? Should I just add a patch for
MacOS to revert to Luxi for the sans serif font?