The steps below will result in successful install Octave and Gnuplot. This approach should be avoided on systems with a [[Octave_for_MacOS_X# Package_Managers|package manager]] such as [http://www.finkproject.org/ Fink], [ http://www.macports.org/ Macports], or [ https://github.com/mxcl/homebrew Homebrew] installed. These instructions were originally copied form [http://bl.anthonysutardja.com/post/24020287559/installing-octave-on-osx-lion Anthony Sutardja]. * [http://sourceforge.net/projects/octave/files/Octave%20MacOSX%20Binary/2011-04-21%20binary%20of%20Octave%203.4.0/ Download the latest OSX binary of Octave] . This is everything that you need to download. Gnuplot, as well as AquaTerm, are included within the dmg. * Mount the image and copy Octave.app to your <code>/Applications/</code> folder. * Inside the Octave image, mount the <code>gnuplot-4.4.3-aqua-i386.dmg</code> which is located in the Extras folder and copy <code>gnuplot.app</code> into your <code>/Applications/</code> folder as well. * In your favorite text editor, open up <code>/Applications/Gnuplot.app/Contents/Resources/bin/gnuplot</code> and replace every instance of <code>DYLD_LIBRARY_PATH</code> with <code>DYLD_FALLBACK_LIBRARY_PATH</code>. There should be four matches that need to be replaced. In vim, you can do this with the following command: :%s/DYLD_LIBRARY_PATH/DYLD_FALLBACK_LIBRARY_PATH/g * ''Optional'': If you want to run Octave from the commandline, you can make an alias to one of the binaries. I would put them somewhere separate from all your other binaries (e.g. <code>~/bin/</code>). If you choose to do this, you must add <code>/Users/YourAccount/bin/</code> to your <code>PATH</code> (as well as making the bin folder). To do this, add the line <code>PATH=/Users/YourAccount/bin:$PATH</code> to your <code>.bash_profile</code> located in your home directory. Then make the following aliases: <pre>sudo ln -sf /Applications/gnuplot.app/Contents/Resources/bin/gnuplot /Users/YourAccount/bin/gnuplot sudo ln -sf /Applications/Octave.app/Contents/Resources/bin/octave /Users/YourAccount/bin/octave</pre> And that’s it! You can type octave at the command-line of Terminal.app to enter the Octave shell.