Despite what the instructions say, the download for OS X is an installer package which you double-click and follow the instructions in the usual way (after unstuffing the original download, of course). It sets up xampp in its own directory in /Applications, with a very nice XAMPP Control Panel to start, stop or reload xampp or any of its services.
You may want to edit the httpd.config file in xampp/etc for your particular setup, perhaps your email address, although that's not necessary. *** Turn off Web Sharing in System Preferences first *** and then start xampp either with this Control Panel or in Terminal and everything should work.
Thanks to the Friends of Apache for this nice installer.
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