SVG export failed w/ Gonville

[takumi ikeda]

%% Unfortunately, SVG exporting failed with Gonville font. I'd like to
just report. (T.I)

\version "2.19.61"

\paper {
  #(define fonts
     (set-global-fonts
      #:music "gonville" ;"cannot find SVG font #f" ??
      #:brace "gonville"
      #:factor (/ staff-height pt 20)
      ))
}

\new GrandStaff <<
  {
    ges''4 \ppp e'' cis''2 \trill
  }
  {
    R1
  }
>>

%% cmd.exe >> lilypond -dbackend=svg ***.ly