--- log_accum.pl	2003-06-05 15:34:59.576398105 -0400
+++ new-log_accum.pl	2003-06-05 15:14:14.175451437 -0400
@@ -779,8 +779,20 @@
 		    print STDERR "main(): doing diff on $dofile\n";
 		}
 		if ($branch ne '') {
+		    my $prior_revision = '0.0';
+		    my $current_revision = '0.0';
+		    open (LOG, "-|")
+			|| exec 'cvs', '-nQq', 'rlog', '-r', "$branch.", "$modulename/$dofile";
+		    while (<LOG>) {
+			if (/^revision ((?:\d+\.)+)(\d+)/) {
+			    $current_revision = $1 . $2;
+			    $prior_revision = $1 . ($2 - 1);
+			    last;
+			}
+		    }
+
 		    open (DIFF, "-|")
-			|| exec 'cvs', '-nQq', 'rdiff', '-r', $branch, '-t', ($do_unidiff ? '-u' : '-c'), "$modulename/$dofile";
+			|| exec 'cvs', '-nQq', 'rdiff', '-r', $prior_revision, '-r', $current_revision, ($do_unidiff ? '-u' : '-c'), "$modulename/$dofile";
 		} else {
 		    open (DIFF, "-|")
 			|| exec 'cvs', '-nQq', 'rdiff', '-t', ($do_unidiff ? '-u' : '-c'), "$modulename/$dofile";