Fixing Gnuplot on OS X 10.6.X and 10.7.X

 

The solution, though, is easy to understand and easy to implement:

1. Open /Applications/Gnuplot.app/Contents/Resources/bin/gnuplot in your favorite text editor. This is a shell script that sets up several environment variables and runs the Gnuplot binary.
2. Find all instances of DYLD_LIBRARY_PATH in that script and replace them with DYLD_FALLBACK_LIBRARY_PATH.
3. Save the edited script.

http://www.leancrew.com/all-this/2012/02/fixing-gnuplot-on-os-x-10-7-3/