Hi Chachi, all I believe I have a source kit that will build correctly for you using gfortran. I've tested on three different generations of Fedora/Redhat linux systems, one with only g77, one with only gfortran, and one with both, and the installation now works on all of them. Please try http://cars9.uchicago.edu/~ifeffit/src/ifeffit-1.2.10_rc1.tar.gz With this tar ball, you will need to install pgplot: tar xvzf ifeffit-1.2.10_rc1.tar.gz cd ifeffit-1.2.10 sh PGPLOT_install ./configure make make install (doing the two 'install steps' with sufficient privilege). Again, you need to install PGPLOT with the provided script. Both the PGPLOT and Ifeffit installations will use gfortran if available, and g77 if gfortran is not available. I think it would not be too difficult to attempt to use Intel's ifort compiler or g95, though I do not know that it's needed-- all linux distribution come with gcc so have easy-to-use packages for gfortran (and, for "legacy", g77). I did get horae-065 and the python wrappers to build with no trouble (once the Tk modules were installed) on all systems, though I haven't done much more than trivial testing. Since I tested only on a few linux boxes, I'd be interested in hearing reports for other systems. I'll wait a few days (or more) to hear reports before uploading this as ifeffit-1.2.10. --Matt