diff --git a/src/pkg/runtime/netbsd/386/defs.h b/src/pkg/runtime/netbsd/386/defs.h
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/386/defs.h
@@ -0,0 +1,17 @@
+// godefs defs.c
+
+// MACHINE GENERATED - DO NOT EDIT.
+
+// Constants
+enum {
+	PROT_NONE = 0,
+	PROT_READ = 0x1,
+	PROT_WRITE = 0x2,
+	PROT_EXEC = 0x4,
+	MAP_ANON = 0x1000,
+	MAP_PRIVATE = 0x2,
+};
+
+// Types
+#pragma pack on
+#pragma pack off
diff --git a/src/pkg/runtime/netbsd/386/rt0.s b/src/pkg/runtime/netbsd/386/rt0.s
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/386/rt0.s
@@ -0,0 +1,9 @@
+// Copyright 2009, 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Darwin, FreeBSD, NetBSD and Linux use the same linkage to main
+
+TEXT	_rt0_386_netbsd(SB),7,$0
+	JMP	_rt0_386(SB)
+
diff --git a/src/pkg/runtime/netbsd/386/signal.c b/src/pkg/runtime/netbsd/386/signal.c
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/386/signal.c
@@ -0,0 +1,10 @@
+// Copyright 2009, 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "runtime.h"
+#include "defs.h"
+#include "signals.h"
+#include "os.h"
+
+// REVISIT incomplete
diff --git a/src/pkg/runtime/netbsd/386/sys.c b/src/pkg/runtime/netbsd/386/sys.c
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/386/sys.c
@@ -0,0 +1,9 @@
+// Copyright 2009, 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+//
+// System calls and other sys.stuff for 386,
+// NetBSD: src/sys/kern/syscalls.master for syscall numbers.
+//
+
+// REVISIT incomplete
diff --git a/src/pkg/runtime/netbsd/amd64/defs.h b/src/pkg/runtime/netbsd/amd64/defs.h
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/amd64/defs.h
@@ -0,0 +1,17 @@
+// godefs -f -m64 defs.c
+
+// MACHINE GENERATED - DO NOT EDIT.
+
+// Constants
+enum {
+	PROT_NONE = 0,
+	PROT_READ = 0x1,
+	PROT_WRITE = 0x2,
+	PROT_EXEC = 0x4,
+	MAP_ANON = 0x1000,
+	MAP_PRIVATE = 0x2,
+};
+
+// Types
+#pragma pack on
+#pragma pack off
diff --git a/src/pkg/runtime/netbsd/amd64/rt0.s b/src/pkg/runtime/netbsd/amd64/rt0.s
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/amd64/rt0.s
@@ -0,0 +1,18 @@
+// Copyright 2009,2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Darwin and Linux use the same linkage to main
+// NetBSD too.
+
+TEXT	_rt0_amd64_linux(SB),7,$-8
+	MOVQ	initcgo(SB), AX
+	TESTQ	AX, AX
+	JZ	2(PC)
+	CALL	AX
+
+	MOVQ	$_rt0_amd64(SB), AX
+	MOVQ	SP, DI
+	JMP	AX
+
+GLOBL initcgo(SB), $8
diff --git a/src/pkg/runtime/netbsd/amd64/signal.c b/src/pkg/runtime/netbsd/amd64/signal.c
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/amd64/signal.c
@@ -0,0 +1,10 @@
+// Copyright 2009, 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "runtime.h"
+#include "defs.h"
+#include "signals.h"
+#include "os.h"
+
+// REVISIT incomplete
diff --git a/src/pkg/runtime/netbsd/amd64/sys.c b/src/pkg/runtime/netbsd/amd64/sys.c
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/amd64/sys.c
@@ -0,0 +1,9 @@
+// Copyright 2009, 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+//
+// System calls and other sys.stuff for 386,
+// NetBSD: src/sys/kern/syscalls.master for syscall numbers.
+//
+
+// REVISIT incomplete
diff --git a/src/pkg/runtime/netbsd/defs.c b/src/pkg/runtime/netbsd/defs.c
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/defs.c
@@ -0,0 +1,30 @@
+// Copyright 2009, 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+ * Input to godefs.
+ *
+        godefs -f -m64 defs.c >amd64/defs.h
+        godefs defs.c >386/defs.h
+ */
+
+// #include <sys/types.h>
+#include <sys/mman.h>
+// #include <signal.h>
+
+enum {
+	$PROT_NONE = PROT_NONE,
+	$PROT_READ = PROT_READ,
+	$PROT_WRITE = PROT_WRITE,
+	$PROT_EXEC = PROT_EXEC,
+
+	$MAP_ANON = MAP_ANON,
+	$MAP_PRIVATE = MAP_PRIVATE,
+};
+
+// typedef struct _ksiginfo _ksiginfo_t;
+// typedef _ksiginfo_t $Ksiginfo;
+// typedef siginfo_t $Siginfo;
+
+// eof
diff --git a/src/pkg/runtime/netbsd/mem.c b/src/pkg/runtime/netbsd/mem.c
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/mem.c
@@ -0,0 +1,35 @@
+// Copyright 2009, 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This file was copied from the OS X and FreeBSD ports.
+// The OS X (Darwin) file was probably the original.
+
+#include "runtime.h"
+#include "defs.h"
+#include "os.h"
+#include "malloc.h"
+
+void*
+SysAlloc(uintptr n)
+{
+	mstats.sys += n;
+	return runtime_mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
+}
+
+void
+SysUnused(void *v, uintptr n)
+{
+	USED(v);
+	USED(n);
+	// TODO(rsc): call madvise MADV_DONTNEED
+}
+
+void
+SysFree(void *v, uintptr n)
+{
+	USED(v);
+	USED(n);
+	// TODO(rsc): acll munmap
+}
+
diff --git a/src/pkg/runtime/netbsd/os.h b/src/pkg/runtime/netbsd/os.h
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/os.h
@@ -0,0 +1,30 @@
+// Copyright 2009, 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//
+// REVISIT will need some thread stuff here.
+//
+// Particularly interesting will be choosing the interface to use:
+//
+// a) the only public interface NetBSD provides is the pthread library
+// b) the private interface(s) that the pthread library use are subject
+//    to change
+// c) only the *dynamic* pthread library provides any assurance that
+//    programs compiled on a particular NetBSD release will run on a
+//    future release; programs using the static pthread library may or
+//    may not work
+// d) at this time, go doesn't support dynamic linking
+//
+// Further, I suspect that since the Darwin, FreeBSD, and Linux
+// ports don't use the pthread libraries on those systems that
+// pthreads is not suitable/sufficient for go.
+//
+// Decisions, decisions.  But at least they can be postponed until
+// more of the port is done.
+//
+
+struct Sigaction;
+void	sigaction(uintptr, struct Sigaction*, struct Sigaction*);
+
+// eof
diff --git a/src/pkg/runtime/netbsd/signals.h b/src/pkg/runtime/netbsd/signals.h
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/signals.h
@@ -0,0 +1,50 @@
+// Copyright 2009, 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#define C SigCatch
+#define I SigIgnore
+#define R SigRestart
+#define Q SigQueue
+
+static SigTab sigtab[] = {
+        /* 0 */         0, "SIGNONE: no trap",
+        /* 1 */         Q+R, "SIGHUP: terminal line hangup",
+        /* 2 */         Q+R, "SIGINT: interrupt program",
+        /* 3 */         C, "SIGQUIT: quit program",
+        /* 4 */         C, "SIGILL: illegal instruction",
+        /* 5 */         C, "SIGTRAP: trace trap",
+        /* 6 */         C, "SIGABRT: abort",
+        /* 7 */         C, "SIGEMT: emulate instrucion executed",
+        /* 8 */         C, "SIGFPE: floating-point exception",
+        /* 9 */         0, "SIGKILL: kill program (cannot be caught or ignored)",
+        /* 10 */        C, "SIGBUS: bus error",
+        /* 11 */        C, "SIGSEGV: segmentation violation",
+        /* 12 */        C, "SIGSYS: invalid system call argument",
+        /* 13 */        I, "SIGPIPE: write to a pipe with no reader",
+        /* 14 */        Q+I+R, "SIGALRM: real-time timer expired",
+        /* 15 */        Q+R, "SIGTERM: software termination signal",
+        /* 16 */        Q+I+R, "SIGURG: urgent condition present on socket",
+        /* 17 */        0, "SIGSTOP: stop (cannot be caught or ignored)",
+        /* 18 */        Q+I+R, "SIGTSTP: stop signal generated from keyboard",
+        /* 19 */        0, "SIGCONT: continue after stop",
+        /* 20 */        Q+I+R, "SIGCHLD: child status has changed",
+        /* 21 */        Q+I+R, "SIGTTIN: background read attempted from control terminal",
+        /* 22 */        Q+I+R, "SIGTTOU: background write attempted to control terminal",
+        /* 23 */        Q+I+R, "SIGIO: I/O now possible on a descriptor",
+        /* 24 */        Q+I+R, "SIGXCPU: CPU time limit exceeded",
+        /* 25 */        Q+I+R, "SIGXFSZ: file size limit exceeded",
+        /* 26 */        Q+I+R, "SIGVTALRM: virtual time alarm",
+        /* 27 */        Q+I+R, "SIGPROF: profiling timer alarm",
+        /* 28 */        Q+I+R, "SIGWINCH: window size change",
+        /* 29 */        Q+I+R, "SIGINFO: status request from keyboard",
+        /* 30 */        Q+I+R, "SIGUSR1: user-defined signal 1",
+        /* 31 */        Q+I+R, "SIGUSR2: user-defined signal 2",
+        /* 32 */        Q+I+R, "SIGPWR: power failure/restart",
+};
+#undef C
+#undef I
+#undef R
+#undef Q
+
+#define NSIG 33
diff --git a/src/pkg/runtime/netbsd/thread.c b/src/pkg/runtime/netbsd/thread.c
new file mode 100644
--- /dev/null
+++ b/src/pkg/runtime/netbsd/thread.c
@@ -0,0 +1,12 @@
+// Copyright 2009, 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// REVISIT more here -- this is where mutexes are implemented.
+// As I can't adopt the OS X, FreeBSD, or Linux implementations
+// I'll have to figure what's the most appropriate implementation.
+
+// REVISIT more here -- see comments in os.h regarding choosing
+// how to implement threads on NetBSD for the go runtime.
+
+// eof