Index: Debconf/Config.pm
===================================================================
--- Debconf/Config.pm	(revision 1851)
+++ Debconf/Config.pm	(working copy)
@@ -24,6 +24,8 @@
 	# I don't use $ENV{HOME} because it can be a bit untrustworthy if
 	# set by programs like sudo, and that proved to be confusing
 	unshift @config_files, ((getpwuid($>))[7])."/.debconfrc";
+} elsif (-f $ENV{DEBCONF_SYSTEMRC}) {
+	@config_files=($ENV{DEBCONF_SYSTEMRC});
 }
 	   
 =head1 DESCRIPTION
Index: doc/man/debconf.7
===================================================================
--- doc/man/debconf.7	(revision 1851)
+++ doc/man/debconf.7	(working copy)
@@ -342,6 +342,8 @@
 .B DEBCONF_SYSTEMRC
 If this environment variable is set, debconf will ignore a user's
 ~/.debconfrc file, and use the system one instead.
+If it is set to the name of a regular file, debconf will use that file
+instead of even the system configuration files.
 .TP
 .B DEBCONF_FORCE_DIALOG
 If this environment variable is set, debconf will use dialog in preference