re := regexp.MustCompile("ptrace(Psw|Fpregs|Per)")
		s = re.ReplaceAllString(s, "Ptrace$1")

		// Replace padding fields inserted by cgo with blank identifiers.
		re = regexp.MustCompile("Pad_cgo[A-Za-z0-9_]*")
		s = re.ReplaceAllString(s, "_")

		// We want to keep the X_ fields that are already consistently exported
		// for the other linux GOARCH settings.
		// Hide them and restore later.

pkg syscall (darwin-amd64), type Termios struct, Oflag uint64
pkg syscall (darwin-amd64), type Termios struct, Ospeed uint64
pkg syscall (darwin-amd64), type Termios struct, Pad_cgo_0 [4]uint8
pkg syscall (darwin-amd64-cgo), const AF_APPLETALK = 16
pkg syscall (darwin-amd64-cgo), const AF_CCITT = 10
pkg syscall (darwin-amd64-cgo), const AF_CHAOS = 5
pkg syscall (darwin-amd64-cgo), const AF_CNT = 21

	for _, f := range fld {
		for _, n := range f.Names {
			if n.Name != prefix {
				n.Name = strings.TrimPrefix(n.Name, prefix)
			}
			if n.Name == "_" {
				// Use exported name instead.
				n.Name = "Pad_cgo_" + strconv.Itoa(npad)
				npad++
			}
			n.Name = upper(n.Name)
		}
	}
}

// fieldPrefix returns the prefix that should be removed from all the