For the Boeing 737:
Default calm wind minimum Vapp = Vref+5kts.
...then adjusted for half the headwind component and the full gust component, aggregate total adjustment not to exceed Vref + 20kts.
Landing performance allows for the gust component to be carried on top of Vref to the point of touchdown if preferred, but the headwind component should have diminished by the 50' Vref point.
Vref is nominated but not adjusted.
These procedures come from both Boeing's FCTM and 2 different airlines, but check your own manuals for what applies for your type.