First, ensure you have the necessary packages installed. Open a terminal and run:

   sudo emerge --ask app-portage/gentoolkit sys-apps/confuse dev-libs/glib

You can download Wikiman from its official repository or clone it from GitHub. Here, we'll use the latter method:

   git clone https://github.com/michiwend/wikiman.git /var/lib/wikiman

Navigate to the Wikiman directory and create a configuration file:

   cd /var/lib/wikiman
   sudo cp config.example.py config.py
   sudo nano config.py  # Edit this file to set up your preferences

Ensure the Wikiman directory and its contents have the appropriate permissions:

   sudo chown -R www-data:www-data /var/lib/wikiman
   sudo chmod -R 750 /var/lib/wikiman

If you are using Apache, create a virtual host configuration for Wikiman. For example, create a file `/etc/apache2/vhosts.d/wikiman.conf`:

   <VirtualHost *:80>
       ServerName wikiman.example.com
       DocumentRoot /var/lib/wikiman

       Alias /static /var/lib/wikiman/static
       <Directory /var/lib/wikiman/static>
           Require all granted
       </Directory>

       WSGIScriptAlias / /var/lib/wikiman/wikiman.wsgi
       <Directory /var/lib/wikiman>
           <Files wikiman.wsgi>
               Require all granted
           </Files>
       </Directory>

       ErrorLog ${APACHE_LOG_DIR}/error.log
       CustomLog ${APACHE_LOG_DIR}/access.log combined
   </VirtualHost>

Restart Apache to apply the changes:

   sudo rc-service apache2 restart

Create a WSGI script at `/var/lib/wikiman/wikiman.wsgi`:

   import os
   os.environ['GSETTINGS_SCHEMA_DIR'] = '/usr/share/glib-2.0/schemas'
   from wikiman import app as application