Stefano, Paul - Unless Paul changed something with the 10.4 build, ifeffit links with pgplot statically, so there should never be a case where ifeffit looks for a dynamic library for pgplot. You can check this with ~> otool -L /Applications/Ifeffit/bin/ifeffit This should list libX11, a curses / termcap library, and system libraries, but not pgplot. If it does list the dynamic pgplot library, the build is broken. I believe that athena / artemis etc would have a related, but slightly different issue. Here, you'll need to use 'otool -L' on the Ifeffit.bundle under the /Library/Perl tree, probably /Library/Perl/5.8.6/darwin-trhead-something/auto/Ifeffit/Ifeffit.bundle Can anyone else confirm / deny if the installer works on OS X 10.4? --Matt