// Use the purego build tag to disable other assembly code,
	// such as in cmd/internal/notsha256.
	cmd := []string{
		pathf("%s/bin/go", goroot_bootstrap),
		"install",
		"-tags=math_big_pure_go compiler_bootstrap purego",
	}
	if vflag > 0 {
		cmd = append(cmd, "-v")
	}
	if tool := os.Getenv("GOBOOTSTRAP_TOOLEXEC"); tool != "" {
		cmd = append(cmd, "-toolexec="+tool)
	}
	cmd = append(cmd, "bootstrap/cmd/...")