This configuration intercepts all userfolder URLs like http://127.0.0.1/~yourname/ and offers a blank wiki page instead, so these instructions are offered as an exercise only. There may be a way around this problem but I don't know what it is.
Using the previous information on the moin OS X installation, you end up with a virtual host block like this:
<VirtualHost *> ServerName Gnarlodious Alias /moin_static160/ /usr/local/share/moin/htdocs/ ScriptAlias /mywiki /usr/local/share/moin/mywiki/moin.cgi RewriteEngine On RewriteRule ^/moin_static160/(.*)$ /usr/local/share/moin/htdocs/$1 [last] RewriteRule ^(.*)$ /usr/local/share/moin/mywiki/moin.cgi$1 [type=application/x-httpd-cgi] </VirtualHost>
Remove the following <IfModule mod_alias.c> directives added on this page, as they are now redundant:
Alias /moin_static160/ "/moinwiki/share/moin/htdocs/" ScriptAlias /mywiki "/moinwiki/share/moin/mywiki/moin.cgi"
Now restart Apache. You should be able to open a URL like http://127.0.0.1/HelpOnInstalling/ApacheOnMacOsx