diff --git a/src/runtime/mgc0.h b/src/runtime/mgc0.h
deleted file mode 100644
index dd0c460246c..00000000000
--- a/src/runtime/mgc0.h
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright 2012 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.
-
-// Used by cmd/gc.
-
-enum {
-	gcBits = 4,
-	BitsPerPointer = 2,
-	BitsDead = 0,
-	BitsScalar = 1,
-	BitsPointer = 2,
-	BitsMask = 3,
-	PointersPerByte = 8/BitsPerPointer,
-	insData = 1,
-	insArray,
-	insArrayEnd,
-	insEnd,
-
-	// 64 bytes cover objects of size 1024/512 on 64/32 bits, respectively.
-	MaxGCMask	= 65536, // TODO(rsc): change back to 64
-};
diff --git a/src/runtime/stack.h b/src/runtime/stack.h
deleted file mode 100644
index b64123e80f4..00000000000
--- a/src/runtime/stack.h
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright 2011 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.
-
-// For the linkers. Must match Go definitions.
-// TODO(rsc): Share Go definitions with linkers directly.
-
-enum {
-#ifdef GOOS_windows
-#define STACKSYSTEM (512 * sizeof(uintptr))
-#endif // GOOS_windows
-#ifdef GOOS_plan9
-#define STACKSYSTEM	512
-#endif // GOOS_plan9
-#ifdef GOOS_darwin
-#ifdef GOARCH_arm
-#define STACKSYSTEM 1024
-#endif // GOARCH_arm
-#endif // GOOS_darwin
-
-#ifndef STACKSYSTEM
-#define STACKSYSTEM 0
-#endif
-
-	/*c2go
-	STACKSYSTEM = 0,
-	*/
-
-	StackSystem = STACKSYSTEM,
-
-	StackBig = 4096,
-	StackGuard = 640 + StackSystem,
-	StackSmall = 128,
-	StackLimit = StackGuard - StackSystem - StackSmall,
-};
-
-#define StackPreempt ((uint64)-1314)
-/*c2go
-enum
-{
-	StackPreempt = 1, // TODO: Change to (uint64)-1314 in Go translation
-};
-*/
diff --git a/src/runtime/typekind.h b/src/runtime/typekind.h
deleted file mode 100644
index 39cd45c2e9f..00000000000
--- a/src/runtime/typekind.h
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2012 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.
-
-// Must match runtime and reflect.
-// Included by cmd/gc.
-
-enum {
-	KindBool = 1,
-	KindInt,
-	KindInt8,
-	KindInt16,
-	KindInt32,
-	KindInt64,
-	KindUint,
-	KindUint8,
-	KindUint16,
-	KindUint32,
-	KindUint64,
-	KindUintptr,
-	KindFloat32,
-	KindFloat64,
-	KindComplex64,
-	KindComplex128,
-	KindArray,
-	KindChan,
-	KindFunc,
-	KindInterface,
-	KindMap,
-	KindPtr,
-	KindSlice,
-	KindString,
-	KindStruct,
-	KindUnsafePointer,
-
-	KindDirectIface = 1 << 5,
-	KindGCProg      = 1 << 6, // Type.gc points to GC program
-	KindNoPointers  = 1 << 7,
-	KindMask        = (1 << 5) - 1,
-};