The Libelium board being based on a RN2483 I don't think you can easily use it as a gateway, as explained in Single-channel Gateway with RN2483.
Next, if you want to create a gateway that is not using the Libelium RN2483 board, then you can still use your Libelium board as a node. For that node to work with a single channel gateway, you'd need to set the node to use the same channel and spreading factor as the single channel gateway listens to.
(For use with a true gateway, nodes would indeed need no changes.)