Comment #30 on issue 2146 by [email protected]: Error: Illegal entry in bfrange block in ToUnicode CMap
http://code.google.com/p/lilypond/issues/detail?id=2146
I don't completely understand the problem (other than "warning messages are printed"), but I certainly have no objection to including the map file in the binaries and documented. It could probably save some people down the road a lot of time and effort.
