CakePHPのインストール時のエラーが出てしまう

前提・実現したいこと

MacOS、XAMPP(7.1.32)入り、Composerインストール済み

「cakePHP超入門」という書籍を見ながらcakephpの学習を進めている者です。

php composer.phar create-project --prefer-dist cakephp/app mycakeapp

というコマンドを実行すると下記のエラーが出ます。

55 15:06:11:desktop php composer.phar create-project --prefer-dist cakephp/app mycakeapp
Installing cakephp/app (3.8.0)
  - Installing cakephp/app (3.8.0): Loading from cache
Created project in mycakeapp
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - cakephp/cakephp 3.8.4 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.8.3 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.8.2 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.8.1 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - cakephp/cakephp 3.8.0 requires ext-intl * -> the requested PHP extension intl is missing from your system.
    - Installation request for cakephp/cakephp 3.8.* -> satisfiable by cakephp/cakephp[3.8.0, 3.8.1, 3.8.2, 3.8.3, 3.8.4].

ここから進められない状況です。
どなたかご教授いただけないでしょうか。