In Debian we have a -$revision version, support that too

dbackup

@@ -1602,8 +1602,8 @@ sub getNumericVer
 {
 	my $a = shift;
 
-	# 000 000 000
-	my @a = split(/\./,$a);
+	# 000 000 000 - 000
+	my @a = split(/[\.\-]/,$a);
 
 	# Quick fix for devel versions
 	$a[2] = 0 if ($a[2] eq "x");