Mac OS X: Plotting with GNU Octave (libfreetype)

For our courses in linear algebra, we are using the GNU Octave software for numerical computation. Since I am using a MacBook Air for university, I had to install Octave on Mac OS X. I simply followed the steps described here and successfully installed gnuplot and the Octave software package. But when I tried to plot something with Octave, I received the following error message:

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