Hi Everybody,
In reply to my question 
, for those who are experiencing difficulty in installing cakephp due to php extensions on mac (and others as well), first I recommend them to read the nice post here https://stackoverflow.com/questions/34199824/what-is-the-difference-between-pear-and-composer to understand php package managers, repositories and libraries, such as pearl pecl composer packagist pear.php.net/packages.php etc…
My 2nd advise to them to read the solution here : https://packagist.org/packages/cakedc/intl . With cakedc/intl it is possible to bypass the intl requirement if you don’t want to use its features.
I am just testing the cakephp now so I don’t need full intl features at the moment therefore this could be soluton for me. In case the intl features are really needed, it seems that some solutions exist in composer.
Good luck.