make web fails in 2.4.5 with ESP ghostscript 8.15

[jmp115]

make web processes a few snippets then chokes on lily-865439453:

-----------------
%% Generated by ../../scripts/lilypond-book.py
%% Options: [quote,raggedright,indent=0\mm]

#(set! toplevel-score-handler ly:parser-print-score)
#(set! toplevel-music-handler (lambda (p m)
                              (ly:parser-print-score
                               p (ly:music-scorify m p))))



\paper {
 #(define dump-extents #t)
 linewidth = 160\mm - 2.0 * 0.4\in
 raggedright = ##t
 indent = 0\mm
}

\layout {
  
}

% ly snippet:
#(define (mc-squared grob orig current)
 (let ((interfaces (ly:grob-property grob 'interfaces))
       (pos (ly:grob-property grob 'staff-position)))
   (if (and (memq 'note-head-interface interfaces)
            (memq pos '(-2 -3 -5)))
       (begin
         (ly:grob-set-property! grob 'print-function 
brew-new-markup-stencil)
         (ly:grob-set-property! grob 'font-family 'roman)
         (ly:grob-set-property!
          grob 'text
          (make-raise-markup
           -0.5
           (case pos
             ((-5) (make-simple-markup "m"))
             ((-3) (make-simple-markup "c "))
             ((-2) (make-smaller-markup (make-bold-markup "2")))
             (else (make-simple-markup "bla")))))))))

\new Voice \relative c' {
  \stemUp
  \set autoBeaming = ##f
  \time 2/4
  <d f g>4
  \once \override NoteHead #'print-function = #Note_head::brew_ez_stencil
  <d f g>
  \once \override NoteHead #'style = #'cross
  <d f g>
  \applyoutput #mc-squared
  <d f g>
  <<
     { d8[ es-( fis^^ g] fis2-) }
     \repeat unfold 5 { \applyoutput #mc-squared s8 }
  >>
}

% end ly snippet
----------------------

Trying to run the offending command myself I get:

-------------------- 
address@hidden:~/lily/lilypond-2.4.5/Documentation/user/out-www$ gs 
-sDEVICE=bbox -dN OPAUSE lily-865439453.eps -c quit ESP Ghostscript 815.00 
(2005-02-08) Copyright (C) 2004 artofcode LLC, Benicia, CA. All rights 
reserved. This software comes with NO WARRANTY: see the file PUBLIC for 
details. Can't find (or can't open) font file n019004l.pfb. Can't find (or 
can't open) font file /usr/local/share/ghostscript/8.15/Resource/ 
Font/NimbusSanL-Bold. Can't find (or can't open) font file NimbusSanL-Bold. 
Can't find (or can't open) font file 
/usr/local/share/ghostscript/8.15/Resource/ Font/NimbusSanL-Bold. Can't 
find (or can't open) font file NimbusSanL-Bold. Querying operating system 
for font files... Didn't find this font on the system! Unable to substitute 
for font. Error: /invalidfont in findfont Operand stack:
  (G) 1 0 Helvetica-Bold Font Helvetica-Bold 1002338 Helvetica-Bo ld 
--nostringval-- Helvetica-Bold NimbusSanL-Bold Execution stack:
  %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval- - 
2 %stopped_push --nostringval-- --nostringval-- --nostringval-- fa lse 1 
%stopped_push 1 3 %oparray_pop 1 3 %oparray_pop --nostri ngval-- 1 3 
%oparray_pop 1 3 %oparray_pop .runexec2 --nostringva l-- --nostringval-- 
--nostringval-- 2 %stopped_push --nostringval-- --nostringval-- 4 5 
%oparray_pop 5 5 %oparray_pop --nostringval-- --nostringval-- 
--nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 8 6 
%oparray_pop --nostringval-- --nostringval-- --nostringval-- 1 -1 1 
--nostringval-- %for_neg_int_continue Dictionary stack:
  --dict:1114/1686(ro)(G)-- --dict:0/20(G)-- --dict:97/200(L)-- --dict:11 
8/300(L)-- --dict:39/200(L)-- --dict:17/17(ro)(G)-- --dict:1114/1686(ro)(G 
)-- Current allocation mode is local Last OS error: 2 Current file position 
is 72093 ESP Ghostscript 815.00: Unrecoverable error, exit code 1 
---------------

Seemingly it can't find a required font file. Should I have this installed 
or is lilypond/gs assuming something it shouldn't?