The XFree86-3.3.3 binary release contains an xterm binary that has been linked statically against libtermcap. This was done to make sure that it will correctly work with all distributions, regardless whether they rely on libtermcap or libncurses. Contrary to the xterm binaries in some beta version following XFree86-3.1.2, this binary does not rely on a recent libncurses being installed on your system.