I tried to install the ifeffit to my macbook (intel processor). But it's failed to run the athena which is software based on ifeffit. The version of ifeffit is "ifeffit-1.2.8-Mac10.4_horae61a_pkg.dmg". This version software works well in iBook (PowerPC).

Who knows whether ifeffit can be run in MAC OS X based on Intel Processor?