There is no need for {} to just specifiy an interface.

src/etc/ldpd.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: ldpd.conf,v 1.2 2010/05/05 09:57:45 michele Exp $
+#	$OpenBSD: ldpd.conf,v 1.3 2010/06/25 22:49:05 claudio Exp $
 
 # macros
 fast="2"
@@ -11,8 +11,8 @@ distribution independent
 retention liberal
 advertisement unsolicited
 
-interface bge0 {
-}
+interface bge0
+
 interface vlan5 {
 	hello-interval $fast
 }