diff --git a/Modules/_multiprocessing/multiprocessing.c b/Modules/_multiprocessing/multiprocessing.c
index fde7c56..448868f 100644
--- a/Modules/_multiprocessing/multiprocessing.c
+++ b/Modules/_multiprocessing/multiprocessing.c
@@ -256,8 +256,19 @@
     if (PyType_Ready(&SemLockType) < 0)
         return;
     Py_INCREF(&SemLockType);
-    PyDict_SetItemString(SemLockType.tp_dict, "SEM_VALUE_MAX",
-                         Py_BuildValue("i", SEM_VALUE_MAX));
+    {
+        PyObject *py_sem_value_max;
+        /* Some systems define SEM_VALUE_MAX as an unsigned value that
+         * causes it to be negative when used as an int (NetBSD). */
+        if ((int)(SEM_VALUE_MAX) < 0)
+            py_sem_value_max = PyLong_FromLong(INT_MAX);
+        else
+            py_sem_value_max = PyLong_FromLong(SEM_VALUE_MAX);
+        if (py_sem_value_max == NULL)
+            return NULL;
+        PyDict_SetItemString(SemLockType.tp_dict, "SEM_VALUE_MAX",
+                             py_sem_value_max);
+    }
     PyModule_AddObject(module, "SemLock", (PyObject*)&SemLockType);
 #endif
 
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 7a7bde9..89d80be 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -379,7 +379,7 @@
 #define SOCKETCLOSE close
 #endif
 
-#if (defined(HAVE_BLUETOOTH_H) || defined(HAVE_BLUETOOTH_BLUETOOTH_H)) && !defined(__NetBSD__)
+#if (defined(HAVE_BLUETOOTH_H) || defined(HAVE_BLUETOOTH_BLUETOOTH_H)) && !defined(__NetBSD__) && !defined(__DragonFly__)
 #define USE_BLUETOOTH 1
 #if defined(__FreeBSD__)
 #define BTPROTO_L2CAP BLUETOOTH_PROTO_L2CAP
@@ -393,11 +393,13 @@
 #define _BT_L2_MEMB(sa, memb) ((sa)->l2cap_##memb)
 #define _BT_RC_MEMB(sa, memb) ((sa)->rfcomm_##memb)
 #define _BT_HCI_MEMB(sa, memb) ((sa)->hci_##memb)
-#elif defined(__NetBSD__)
+#elif defined(__NetBSD__) || defined(__DragonFly__)
 #define sockaddr_l2 sockaddr_bt
 #define sockaddr_rc sockaddr_bt
 #define sockaddr_hci sockaddr_bt
 #define sockaddr_sco sockaddr_bt
+#define SOL_HCI BTPROTO_HCI
+#define HCI_DATA_DIR SO_HCI_DIRECTION
 #define _BT_L2_MEMB(sa, memb) ((sa)->bt_##memb)
 #define _BT_RC_MEMB(sa, memb) ((sa)->bt_##memb)
 #define _BT_HCI_MEMB(sa, memb) ((sa)->bt_##memb)
@@ -1076,9 +1078,13 @@
         case BTPROTO_HCI:
         {
             struct sockaddr_hci *a = (struct sockaddr_hci *) addr;
+#if defined(__NetBSD__) || defined(__DragonFly__)
+            return makebdaddr(&_BT_HCI_MEMB(a, bdaddr));
+#else
             PyObject *ret = NULL;
             ret = Py_BuildValue("i", _BT_HCI_MEMB(a, dev));
             return ret;
+#endif
         }
 
 #if !defined(__FreeBSD__)
@@ -1362,12 +1368,25 @@
         case BTPROTO_HCI:
         {
             struct sockaddr_hci *addr = (struct sockaddr_hci *)addr_ret;
+#if defined(__NetBSD__) || defined(__DragonFly__)
+			char *straddr = PyBytes_AS_STRING(args);
+
+			_BT_HCI_MEMB(addr, family) = AF_BLUETOOTH;
+            if (straddr == NULL) {
+                PyErr_SetString(socket_error, "getsockaddrarg: "
+                    "wrong format");
+                return 0;
+            }
+            if (setbdaddr(straddr, &_BT_HCI_MEMB(addr, bdaddr)) < 0)
+                return 0;
+#else
             _BT_HCI_MEMB(addr, family) = AF_BLUETOOTH;
             if (!PyArg_ParseTuple(args, "i", &_BT_HCI_MEMB(addr, dev))) {
                 PyErr_SetString(socket_error, "getsockaddrarg: "
                                 "wrong format");
                 return 0;
             }
+#endif
             *len_ret = sizeof *addr;
             return 1;
         }
@@ -4644,9 +4663,13 @@
     PyModule_AddIntConstant(m, "BTPROTO_L2CAP", BTPROTO_L2CAP);
     PyModule_AddIntConstant(m, "BTPROTO_HCI", BTPROTO_HCI);
     PyModule_AddIntConstant(m, "SOL_HCI", SOL_HCI);
+#if !defined(__NetBSD__) && !defined(__DragonFly__)
     PyModule_AddIntConstant(m, "HCI_FILTER", HCI_FILTER);
+#endif
 #if !defined(__FreeBSD__)
+#if !defined(__NetBSD__) && !defined(__DragonFly__)
     PyModule_AddIntConstant(m, "HCI_TIME_STAMP", HCI_TIME_STAMP);
+#endif
     PyModule_AddIntConstant(m, "HCI_DATA_DIR", HCI_DATA_DIR);
     PyModule_AddIntConstant(m, "BTPROTO_SCO", BTPROTO_SCO);
 #endif