参考：http://octave.1599824.n4.nabble.com/Mac-OS-X-Mountain-Lion-Octave-can-not-execute-sombrero-td4643502.html
Octave版本：3.4.0
Mac版本：10.8.5
前提：装好了X11
It works perfectly on 10.8 and the solution is pretty simple.
The problem is in gnuplot.
Instead of using bundled libfreetype, it should use the one that comes with your X11:
cd /Applications/Gnuplot.app/Contents/Resources/lib
mv libfreetype..dylib libfreetype..dylib.bak
ln -s /usr/X11/lib/libfreetype..dylib .