Hey,
Have you completed Dah and Roshani's first missions ?
After you complete Dah's Fortress, Dah will be put in a cage in the village. If you leave the village and return later to his cage, a cutscene should play and you should get a new mission. Complete the mission and then speak to Dah and the hut should be buildable.
Same with Roshani. If you speak to him while he's in the cage, he'll give you the fire bomb and a new mission. Complete that and return to the village, speak to him and then you should be able to build his hut.
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