If one needs to [re-]enable export function in XBow XServe in their Eko platform, use "-e" commandline key not "-xc" as suggested by the [outdated] XServe manual.
To have these parameters apply to xserve service running from /etc/init.d/xserve one has to put them in /usr/xbow/xserve/xparams.args file. This file however does get overwritten when XServe is upgraded via web interface, so make sure you restore your custom values after upgrade.