En Terminal:

sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/hosts

Agrego: 127.0.0.1    proyecto.dev

sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /Applications/XAMPP/xamppfiles/etc/extra/httpd-vhosts.conf

Agrego:

<VirtualHost *:80>
  ServerName arqfiles.dev
  DocumentRoot "/Users/[usuario]/[ruta-proyecto]"
  <Directory "/Users/[usuario]/[ruta-proyecto]">
    Order allow,deny
    Allow from all
    RewriteEngine On
    RewriteBase /
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ index.php/$1 [L]
  </Directory>
</VirtualHost>

Reiniciar Apache.