Websockets installation instructions for Debian:

# TODO: Most of this can be scripted.
# TODO: Better handling of external dependencies (websocket_plugin.h).  

# as root

# see also /usr/share/doc/apache2/README.multiple-instances
% sh /usr/share/doc/apache2.2-common/examples/setup-instance websockets

% cp examples/apache2/websockets.conf /etc/apache2-websockets/sites-available/

# activate the websockets configuration
% a2ensite-websockets websockets.conf 

# deactivate the default site
% a2dissite-websockets default 

# remove most of the mods with this shell script

MODS=$(apache2ctl-websockets -M | grep shared | grep -v 'Syntax OK' | sed 's/_module//g' | cut -d' ' -f2 | xargs);
for mod in $MODS; do
    if [ $mod = 'mime' -o $mod = 'ssl' -o $mod = 'websocket' ]; then
        echo "* Leaving module $mod in place";
    else
        echo "* Disabling module $mod";
        a2dismod-websockets $mod;
    fi;
done

# follow the instructions for installing Apache mod_websockets at
# https://github.com/disconnect/apache-websocket

# copy the headers into place so OpenSRF can compile
% cp $LOCATION_OF_APACHE_WEBSOCKET_CHECKOUT/websocket_plugin.h src/gateway/

# install OpenSRF

# remove the websocket module from the default OpenSRF Apache instance
% a2dismod osrf_websocket_translator

# After OpenSRF is up and running, fire up the secondary Apache instance
# errors will appear in /var/log/apache2-websockets/error.log
% /etc/init.d/apache2-websockets restart