GTK+ 1.2.3 or higher. GTK+/Glib is included with most systems now. If you don't have it installed, you may want to check to see if your vendor has a package available. If not, you can download the latest version of GTK+ and Glib from ftp://ftp.gtk.org/pub/gtk. gFTP will work with either version 1.2 or 2.x of GTK+, but I would recommend using GTK+ 2.x.
pthread libraries. Most systems already satisfy this requirement. If you are on a platform other than Linux, you may want to take a look at the FSU Pthreads library at http://www.informatik.hu-berlin.de/~mueller/pthreads.