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In case someone is stuck with older versions of roslaunch due to other dependencies, here is a workaround:

<arg name="robot"  default="mh5_mesh" />

<arg name="path"   value="(find $(arg robot)...)" />
<arg name="dollar" value="$" />

<include file="$(arg dollar)$(arg path)"  />

In my case I needed it to call the appropriate moveit_config file based on the robot and this hack works fine on ROS indigo