To build xwindiff, first type: ./configure This will produce a file "config.h", among others. Next, type: xmkmf (Solaris users: make sure OPENWINHOME is set before this step, usually to /usr/openwin) (HP-UX users: after this step, you may find that you need to add -I/usr/contrib/X11R6/include and -L/usr/contrib/X11R6/lib to the Makefile by hand) This will produce a file "Makefile". Finally, type: make To install, type: make install Any problems or suggestions, email dmd@datcon.co.uk xwindiff is covered by the GNU General Public License. See the file COPYING for copying conditions.