I have a MacBook Pro from 2012 and I run OS X 10.9.
/Users/Martin/Library/Fonts: caching, new cache contents: 27 fonts, 1 dirs
/Users/Martin/Library/Fonts/truetype: caching, new cache contents: 0 fonts, 1 dirs
/Users/Martin/Library/Fonts/truetype/denemo: caching, new cache contents: 3 fonts, 0 dirs
/Users/Martin/.lilypond-fonts.cache-2: cleaning cache directory
/usr/var/cache/fontconfig: not cleaning non-existent cache directory
/Users/Martin/.fontconfig: cleaning cache directory
/Applications/Denemo.app/Contents/MacOS/../Resources/bin/fc-cache: succeeded
dyld: Symbol not found: _xmlBufContent
Referenced from: /usr/lib/libxslt.1.dylib
Expected in: /Applications/Denemo.app/Contents/MacOS/../Resources/bin/../lib//libxml2.2.dylib
in /usr/lib/libxslt.1.dylib
./denemo.sh: line 36: 900 Trace/BPT trap: 5 $PREFIX/bin/denemo