Enable clean URLs for Drupal 6.x on Snow Leopard

By default clean URLs cannot be enabled on Snow Leopard (Macbook pro) unless one of the following prerequisites is done:

1. If your web document root is /Library/WebServer/Documents and drupal is installed in  /Library/WebServer/Documents/drupal then in /etc/apache2/httpd.conf find the document root  <Directory "/Library/WebServer/Documents"> and change AllowOverride None to AllowOverride All like below.
   

   #
   # This should be changed to whatever you set DocumentRoot to.
   #
   <Directory "/Library/WebServer/Documents">
       #
       # Possible values for the Options directive are "None", "All",
       # or any combination of:
       #   Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
       #
       # Note that "MultiViews" must be named *explicitly* --- "Options All"
       # doesn't give it to you.
       #
       # The Options directive is both complicated and important.  Please see
       # http://httpd.apache.org/docs/2.2/mod/core.html#options
       # for more information.
       #
       Options Indexes FollowSymLinks MultiViews
   
       #
       # AllowOverride controls what directives may be placed in .htaccess files.
       # It can be "All", "None", or any combination of the keywords:
       #   Options FileInfo AuthConfig Limit
       #
       AllowOverride None
   
       #
       # Controls who can get stuff from this server.
       #
       Order allow,deny
       Allow from all
   
   </Directory>
   

2. If drupal is installed in /Users/<user>/Sites/drupal then edit /etc/apache2/users/<user>.conf to look like below.
   

   Alias /drupal /Users/<user>/Sites/drupal
   <Directory "/Users/<user>/Sites/">
       Options Indexes FollowSymlinks Multiviews
       AllowOverride All
       Order allow,deny
       Allow from all
   </Directory>
   

   FollowSymlinks has been added and AllowOverride has been set to All. Finally in /Users/<user>/Sites/drupal/.htaccess set RewriteBase to /drupal.

   ...
     # Modify the RewriteBase if you are using Drupal in a subdirectory or in a
     # VirtualDocumentRoot and the rewrite rules are not working properly.
     # For example if your site is at http://example.com/drupal uncomment and
     # modify the following line:
     RewriteBase /drupal
     #
     # If your site is running in a VirtualDocumentRoot at http://example.com/,
     # uncomment the following line:
     # RewriteBase /
   ...