diff --git a/unix/ztypes_darwin_386.go b/unix/ztypes_darwin_386.go
index 6103f215..dd56ab84 100644
--- a/unix/ztypes_darwin_386.go
+++ b/unix/ztypes_darwin_386.go
@@ -92,9 +92,9 @@ type Statfs_t struct {
 	Type        uint32
 	Flags       uint32
 	Fssubtype   uint32
-	Fstypename  [16]int8
-	Mntonname   [1024]int8
-	Mntfromname [1024]int8
+	Fstypename  [16]byte
+	Mntonname   [1024]byte
+	Mntfromname [1024]byte
 	Reserved    [8]uint32
 }
 
@@ -305,7 +305,6 @@ type IfMsghdr struct {
 	Addrs   int32
 	Flags   int32
 	Index   uint16
-	_       [2]byte
 	Data    IfData
 }
 
@@ -348,7 +347,6 @@ type IfaMsghdr struct {
 	Addrs   int32
 	Flags   int32
 	Index   uint16
-	_       [2]byte
 	Metric  int32
 }
 
@@ -369,7 +367,6 @@ type IfmaMsghdr2 struct {
 	Addrs    int32
 	Flags    int32
 	Index    uint16
-	_        [2]byte
 	Refcount int32
 }
 
@@ -378,7 +375,6 @@ type RtMsghdr struct {
 	Version uint8
 	Type    uint8
 	Index   uint16
-	_       [2]byte
 	Flags   int32
 	Addrs   int32
 	Pid     int32
@@ -400,7 +396,8 @@ type RtMetrics struct {
 	Rtt      uint32
 	Rttvar   uint32
 	Pksent   uint32
-	Filler   [4]uint32
+	State    uint32
+	Filler   [3]uint32
 }
 
 const (
diff --git a/unix/ztypes_darwin_amd64.go b/unix/ztypes_darwin_amd64.go
index e6576d1c..1f82f2b5 100644
--- a/unix/ztypes_darwin_amd64.go
+++ b/unix/ztypes_darwin_amd64.go
@@ -70,7 +70,6 @@ type Stat_t struct {
 	Uid     uint32
 	Gid     uint32
 	Rdev    int32
-	_       [4]byte
 	Atim    Timespec
 	Mtim    Timespec
 	Ctim    Timespec
@@ -97,10 +96,11 @@ type Statfs_t struct {
 	Type        uint32
 	Flags       uint32
 	Fssubtype   uint32
-	Fstypename  [16]int8
-	Mntonname   [1024]int8
-	Mntfromname [1024]int8
-	Reserved    [8]uint32
+	Fstypename  [16]byte
+	Mntonname   [1024]byte
+	Mntfromname [1024]byte
+	Flags_ext   uint32
+	Reserved    [7]uint32
 }
 
 type Flock_t struct {
@@ -133,8 +133,7 @@ type Fbootstraptransfer_t struct {
 
 type Log2phys_t struct {
 	Flags uint32
-	_     [8]byte
-	_     [8]byte
+	_     [16]byte
 }
 
 type Fsid struct {
@@ -225,10 +224,8 @@ type IPv6Mreq struct {
 type Msghdr struct {
 	Name       *byte
 	Namelen    uint32
-	_          [4]byte
 	Iov        *Iovec
 	Iovlen     int32
-	_          [4]byte
 	Control    *byte
 	Controllen uint32
 	Flags      int32
@@ -313,7 +310,6 @@ type IfMsghdr struct {
 	Addrs   int32
 	Flags   int32
 	Index   uint16
-	_       [2]byte
 	Data    IfData
 }
 
@@ -356,7 +352,6 @@ type IfaMsghdr struct {
 	Addrs   int32
 	Flags   int32
 	Index   uint16
-	_       [2]byte
 	Metric  int32
 }
 
@@ -377,7 +372,6 @@ type IfmaMsghdr2 struct {
 	Addrs    int32
 	Flags    int32
 	Index    uint16
-	_        [2]byte
 	Refcount int32
 }
 
@@ -386,7 +380,6 @@ type RtMsghdr struct {
 	Version uint8
 	Type    uint8
 	Index   uint16
-	_       [2]byte
 	Flags   int32
 	Addrs   int32
 	Pid     int32
@@ -408,7 +401,8 @@ type RtMetrics struct {
 	Rtt      uint32
 	Rttvar   uint32
 	Pksent   uint32
-	Filler   [4]uint32
+	State    uint32
+	Filler   [3]uint32
 }
 
 const (
@@ -431,7 +425,6 @@ type BpfStat struct {
 
 type BpfProgram struct {
 	Len   uint32
-	_     [4]byte
 	Insns *BpfInsn
 }
 
@@ -456,7 +449,6 @@ type Termios struct {
 	Cflag  uint64
 	Lflag  uint64
 	Cc     [20]uint8
-	_      [4]byte
 	Ispeed uint64
 	Ospeed uint64
 }
diff --git a/unix/ztypes_darwin_arm.go b/unix/ztypes_darwin_arm.go
index af9560fa..3af01a49 100644
--- a/unix/ztypes_darwin_arm.go
+++ b/unix/ztypes_darwin_arm.go
@@ -1,6 +1,5 @@
-// NOTE: cgo can't generate struct Stat_t and struct Statfs_t yet
-// Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_darwin.go
+// cgo -godefs types_darwin.go | go run mkpost.go
+// Code generated by the command above; see README.md. DO NOT EDIT.
 
 // +build arm,darwin
 
@@ -31,7 +30,7 @@ type Timeval struct {
 	Usec int32
 }
 
-type Timeval32 [0]byte
+type Timeval32 struct{}
 
 type Rusage struct {
 	Utime    Timeval
@@ -93,9 +92,9 @@ type Statfs_t struct {
 	Type        uint32
 	Flags       uint32
 	Fssubtype   uint32
-	Fstypename  [16]int8
-	Mntonname   [1024]int8
-	Mntfromname [1024]int8
+	Fstypename  [16]byte
+	Mntonname   [1024]byte
+	Mntfromname [1024]byte
 	Reserved    [8]uint32
 }
 
@@ -306,7 +305,6 @@ type IfMsghdr struct {
 	Addrs   int32
 	Flags   int32
 	Index   uint16
-	_       [2]byte
 	Data    IfData
 }
 
@@ -349,7 +347,6 @@ type IfaMsghdr struct {
 	Addrs   int32
 	Flags   int32
 	Index   uint16
-	_       [2]byte
 	Metric  int32
 }
 
@@ -370,7 +367,6 @@ type IfmaMsghdr2 struct {
 	Addrs    int32
 	Flags    int32
 	Index    uint16
-	_        [2]byte
 	Refcount int32
 }
 
@@ -379,7 +375,6 @@ type RtMsghdr struct {
 	Version uint8
 	Type    uint8
 	Index   uint16
-	_       [2]byte
 	Flags   int32
 	Addrs   int32
 	Pid     int32
@@ -401,7 +396,8 @@ type RtMetrics struct {
 	Rtt      uint32
 	Rttvar   uint32
 	Pksent   uint32
-	Filler   [4]uint32
+	State    uint32
+	Filler   [3]uint32
 }
 
 const (
diff --git a/unix/ztypes_darwin_arm64.go b/unix/ztypes_darwin_arm64.go
index a09c0f94..ff437386 100644
--- a/unix/ztypes_darwin_arm64.go
+++ b/unix/ztypes_darwin_arm64.go
@@ -70,7 +70,6 @@ type Stat_t struct {
 	Uid     uint32
 	Gid     uint32
 	Rdev    int32
-	_       [4]byte
 	Atim    Timespec
 	Mtim    Timespec
 	Ctim    Timespec
@@ -97,10 +96,11 @@ type Statfs_t struct {
 	Type        uint32
 	Flags       uint32
 	Fssubtype   uint32
-	Fstypename  [16]int8
-	Mntonname   [1024]int8
-	Mntfromname [1024]int8
-	Reserved    [8]uint32
+	Fstypename  [16]byte
+	Mntonname   [1024]byte
+	Mntfromname [1024]byte
+	Flags_ext   uint32
+	Reserved    [7]uint32
 }
 
 type Flock_t struct {
@@ -133,8 +133,7 @@ type Fbootstraptransfer_t struct {
 
 type Log2phys_t struct {
 	Flags uint32
-	_     [8]byte
-	_     [8]byte
+	_     [16]byte
 }
 
 type Fsid struct {
@@ -225,10 +224,8 @@ type IPv6Mreq struct {
 type Msghdr struct {
 	Name       *byte
 	Namelen    uint32
-	_          [4]byte
 	Iov        *Iovec
 	Iovlen     int32
-	_          [4]byte
 	Control    *byte
 	Controllen uint32
 	Flags      int32
@@ -313,7 +310,6 @@ type IfMsghdr struct {
 	Addrs   int32
 	Flags   int32
 	Index   uint16
-	_       [2]byte
 	Data    IfData
 }
 
@@ -356,7 +352,6 @@ type IfaMsghdr struct {
 	Addrs   int32
 	Flags   int32
 	Index   uint16
-	_       [2]byte
 	Metric  int32
 }
 
@@ -377,7 +372,6 @@ type IfmaMsghdr2 struct {
 	Addrs    int32
 	Flags    int32
 	Index    uint16
-	_        [2]byte
 	Refcount int32
 }
 
@@ -386,7 +380,6 @@ type RtMsghdr struct {
 	Version uint8
 	Type    uint8
 	Index   uint16
-	_       [2]byte
 	Flags   int32
 	Addrs   int32
 	Pid     int32
@@ -408,7 +401,8 @@ type RtMetrics struct {
 	Rtt      uint32
 	Rttvar   uint32
 	Pksent   uint32
-	Filler   [4]uint32
+	State    uint32
+	Filler   [3]uint32
 }
 
 const (
@@ -431,7 +425,6 @@ type BpfStat struct {
 
 type BpfProgram struct {
 	Len   uint32
-	_     [4]byte
 	Insns *BpfInsn
 }
 
@@ -456,7 +449,6 @@ type Termios struct {
 	Cflag  uint64
 	Lflag  uint64
 	Cc     [20]uint8
-	_      [4]byte
 	Ispeed uint64
 	Ospeed uint64
 }