Comment #4 on issue 3161 by [email protected]: Patch: Standardizes use of empty extents in pure heights and skylines.
http://code.google.com/p/lilypond/issues/detail?id=3161
Way odd...compiles clean on my machine. I don't think the rebase made much of a difference, but I'd appreciate it if you tested it out anyway. If this doesn't compile, perhaps try to compile master by itself and/or do a make clean.
