Hi everyone Working on MacOs10.4 computer, after several unsuccessful installations of ifeffit package....I have the following message when I try to run Athena from the Terminal window. I downloaded Tk-804.027.tar and installed it in "temp" directory, but I still have the same message...have you ever had this error? ************ Can't load '/Library/Perl/5.8.6/darwin-thread-multi-2level/auto/Tk/Tk.bundle' for module Tk: dlopen(/Library/Perl/5.8.6/darwin-thread-multi-2level/auto/Tk/Tk.bundle, 1): Library not loaded: /usr/X11R6/lib/libX11.6.dylib Referenced from: /Library/Perl/5.8.6/darwin-thread-multi-2level/auto/Tk/Tk.bundle Reason: image not found at /System/Library/Perl/5.8.6/darwin-thread-multi-2level/DynaLoader.pm line 230. at /Applications/Ifeffit/bin/athena line 52 Compilation failed in require at /Applications/Ifeffit/bin/athena line 52. BEGIN failed--compilation aborted at /Applications/Ifeffit/bin/athena line 52. ********** thanks in advance for your help Emmanuelle MONTARGES-PELLETIER