Index: boost/asio/detail/impl/kqueue_reactor.ipp
===================================================================
--- boost/asio/detail/impl/kqueue_reactor.ipp	(revision 65468)
+++ boost/asio/detail/impl/kqueue_reactor.ipp	(working copy)
@@ -26,6 +26,14 @@
 
 #include <boost/asio/detail/push_options.hpp>
 
+#ifdef __NetBSD__
+#define TO_KQUEUE_DATA(x) reinterpret_cast<intptr_t>(x) 
+#define FROM_KQUEUE_DATA(x) reinterpret_cast<void*>(x)
+#else
+#define TO_KQUEUE_DATA(x) x
+#define FROM_KQUEUE_DATA(x) x
+#endif
+
 namespace boost {
 namespace asio {
 namespace detail {
@@ -130,17 +138,17 @@
     {
     case read_op:
       EV_SET(&event, descriptor, EVFILT_READ,
-          EV_ADD | EV_ONESHOT, 0, 0, descriptor_data);
+          EV_ADD | EV_ONESHOT, 0, 0, TO_KQUEUE_DATA(descriptor_data));
       break;
     case write_op:
       EV_SET(&event, descriptor, EVFILT_WRITE,
-          EV_ADD | EV_ONESHOT, 0, 0, descriptor_data);
+          EV_ADD | EV_ONESHOT, 0, 0, TO_KQUEUE_DATA(descriptor_data));
       break;
     case except_op:
       if (!descriptor_data->op_queue_[read_op].empty())
         return; // Already registered for read events.
       EV_SET(&event, descriptor, EVFILT_READ,
-          EV_ADD | EV_ONESHOT, EV_OOBAND, 0, descriptor_data);
+          EV_ADD | EV_ONESHOT, EV_OOBAND, 0, TO_KQUEUE_DATA(descriptor_data));
       break;
     }
 
@@ -234,7 +242,7 @@
   for (int i = 0; i < num_events; ++i)
   {
     int descriptor = events[i].ident;
-    void* ptr = events[i].udata;
+    void* ptr = FROM_KQUEUE_DATA(events[i].udata);
     if (ptr == &interrupter_)
     {
       // No need to reset the interrupter since we're leaving the descriptor
@@ -247,7 +255,7 @@
 
       // Exception operations must be processed first to ensure that any
       // out-of-band data is read before normal data.
-      static const int filter[max_ops] =
+      static const unsigned int filter[max_ops] =
         { EVFILT_READ, EVFILT_WRITE, EVFILT_READ };
       for (int j = max_ops - 1; j >= 0; --j)
       {
@@ -283,16 +291,16 @@
       case EVFILT_READ:
         if (!descriptor_data->op_queue_[read_op].empty())
           EV_SET(&event, descriptor, EVFILT_READ,
-              EV_ADD | EV_ONESHOT, 0, 0, descriptor_data);
+              EV_ADD | EV_ONESHOT, 0, 0, TO_KQUEUE_DATA(descriptor_data));
         else if (!descriptor_data->op_queue_[except_op].empty())
           EV_SET(&event, descriptor, EVFILT_READ,
-              EV_ADD | EV_ONESHOT, EV_OOBAND, 0, descriptor_data);
+              EV_ADD | EV_ONESHOT, EV_OOBAND, 0, TO_KQUEUE_DATA(descriptor_data));
         else
           continue;
       case EVFILT_WRITE:
         if (!descriptor_data->op_queue_[write_op].empty())
           EV_SET(&event, descriptor, EVFILT_WRITE,
-              EV_ADD | EV_ONESHOT, 0, 0, descriptor_data);
+              EV_ADD | EV_ONESHOT, 0, 0, TO_KQUEUE_DATA(descriptor_data));
         else
           continue;
       default:
@@ -323,7 +331,7 @@
 {
   struct kevent event;
   EV_SET(&event, interrupter_.read_descriptor(),
-      EVFILT_READ, EV_ADD | EV_ONESHOT, 0, 0, &interrupter_);
+      EVFILT_READ, EV_ADD | EV_ONESHOT, 0, 0, TO_KQUEUE_DATA(&interrupter_));
   ::kevent(kqueue_fd_, &event, 1, 0, 0, 0);
 }