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File: //usr/share/doc/dialog/samples/README
-- $Id: README,v 1.4 2012/12/02 18:52:52 tom Exp $

You can set the environment-variable DIALOG to whatever program you
want to check. Default is "dialog".

Use "export DIALOG=/usr/bin/dialog" for sh or "setenv DIALOG ../dialog" for csh
to test the /usr/bin/dialog program.