Casting 0 to an iterator is not portable. Just use end() in that case.

cad/verilog-current/distinfo

@@ -1,7 +1,8 @@
-$NetBSD: distinfo,v 1.31 2011/11/26 17:10:24 joerg Exp $
+$NetBSD: distinfo,v 1.32 2013/05/23 15:00:00 joerg Exp $
 
 SHA1 (verilog-20090923.tar.gz) = 1836ebc4ef78341fb1a077e807c8d5b195ebb253
 RMD160 (verilog-20090923.tar.gz) = 32a009d1390e71721d3a72a1940b655ed1853ba5
 Size (verilog-20090923.tar.gz) = 1121376 bytes
 SHA1 (patch-ad) = 9492af75153405c49076f2dcd11d2dc338640514
+SHA1 (patch-net__scope.cc) = 97cf7d099b30b3549ad6262022ca32e8790b5d66
 SHA1 (patch-pform__disciplines.cc) = 113365b68723462791728e6f998685a4ebca3547

cad/verilog-current/patches/patch-net__scope.cc

@@ -0,0 +1,17 @@
+$NetBSD: patch-net__scope.cc,v 1.1 2013/05/23 15:00:00 joerg Exp $
+
+--- net_scope.cc.orig	2013-05-22 14:46:10.000000000 +0000
++++ net_scope.cc
+@@ -221,11 +221,7 @@ map<perm_string,NetScope::param_expr_t>:
+       if (idx != parameters.end())
+ 	    return idx;
+ 
+-      idx = localparams.find(perm_string::literal(key));
+-      if (idx != localparams.end())
+-	    return idx;
+-
+-      return (map<perm_string,param_expr_t>::iterator) 0;
++      return localparams.find(perm_string::literal(key));
+ }
+ 
+ NetScope::TYPE NetScope::type() const