The GI group at Monash University who developed the low FODMAP diet states in their FAQ that gluten is not a FODMAP nor is it an IBS trigger. See the answer to question #5 for clarification.
5. What is the difference between 'gluten-free' and 'wheat-free' foods? Do I have to restrict gluten?
"When following the low FODMAP diet, fructans [eg. wheat, rye & barley] and other FODMAPs, but not gluten, are restricted."
Also, the Monash group showed that if individuals who think they are gluten sensitive are put on a low FODMAP diet for a while and then given pure gluten that there was no worsening of symptoms. This article on a Celiac information web site give a good overview of this research
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The FODMAP approach does not lump gluten in with fructose and lactose ...
