diff --git a/Misc/ACKS b/Misc/ACKS
index bd300de..7d4c1bf 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -492,6 +492,7 @@
 Sjoerd Mullender
 Sape Mullender
 Michael Muller
+Piotr Meyer
 John Nagle
 Takahiro Nakayama
 Travers Naran
diff --git a/Misc/NEWS b/Misc/NEWS
index d78220e..a52e37a 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -53,6 +53,8 @@
 Library
 -------
 
+- Issue #5400: Added patch for multiprocessing on netbsd compilation/support
+
 - Issue #5387: Fixed mmap.move crash by integer overflow.
 
 - Issue #5261: Patch multiprocessing's semaphore.c to support context
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index d903eca..c6c8a30 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -520,7 +520,11 @@
 #ifdef MREMAP_MAYMOVE
 		newmap = mremap(self->data, self->size, new_size, MREMAP_MAYMOVE);
 #else
-		newmap = mremap(self->data, self->size, new_size, 0);
+		#if defined(__NetBSD__)
+			newmap = mremap(self->data, self->size, self->data, new_size, 0);
+		#else
+			newmap = mremap(self->data, self->size, new_size, 0);
+		#endif /* __NetBSD__ */
 #endif
 		if (newmap == (void *)-1)
 		{
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 35809ee..c229c07 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -382,7 +382,7 @@
 #define SOCKETCLOSE close
 #endif
 
-#if defined(HAVE_BLUETOOTH_H) || defined(HAVE_BLUETOOTH_BLUETOOTH_H)
+#if defined(HAVE_BLUETOOTH_H) || defined(HAVE_BLUETOOTH_BLUETOOTH_H) &&  !defined(__NetBSD__)
 #define USE_BLUETOOTH 1
 #if defined(__FreeBSD__)
 #define BTPROTO_L2CAP BLUETOOTH_PROTO_L2CAP
diff --git a/setup.py b/setup.py
index 522eb82..3c25172 100644
--- a/setup.py
+++ b/setup.py
@@ -1023,6 +1023,15 @@
                 )
             libraries = []
 
+        elif platform.startswith('netbsd'):
+            macros = dict(                  # at least NetBSD 5
+                HAVE_SEM_OPEN=1,
+                HAVE_SEM_TIMEDWAIT=0,
+                HAVE_FD_TRANSFER=1,
+                HAVE_BROKEN_SEM_GETVALUE=1
+                )
+            libraries = []
+
         else:                                   # Linux and other unices
             macros = dict(
                 HAVE_SEM_OPEN=1,