Stefano, Paul, I just tried this on a fairly fresh OS 10.4 machine (Ifeffit had been installed over a year ago, when it was a 10.3 machine, and I wiped /Library/Perl/5.8.1 and /Applications/Ifeffit, and cleared the /Library/Receipt for Ifeffit....). I got the same behaviour as Stefano. It looks like everything did get installed this time, but that the resulting version of Ifeffit depends on Aquaterm. Downloading and installing Aquaterm from the disk-image package from sourceforge.net was simple (though it requires a privileged password) and made Athena and Artemis run fine. So my immediate recommendation is to install Aquaterm from Sourceforge. http://sourceforge.net/projects/aquaterm/ --Matt PS: We should probably also figure out how to not depend on Aquaterm, but telling people they need Aquaterm as well as X11.app seems simple enough.