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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.