I say, and with God's success: Facing the Qibla and turning away from it while relieving oneself is strictly disliked, whether in the desert or in buildings; as narrated by Al-Bukhari in his Sahih, from Abu Ayyub Al-Ansari, may Allah be pleased with him, who reported: "When you go to relieve yourselves, do not face the Qibla and do not turn your backs to it, but rather face the east or the west." He did not differentiate between open spaces and houses, and the difference between open spaces and houses is that there is a barrier like a wall, but there is a barrier in open spaces as well, such as mountains and others, which does not prevent the dislike, so the same applies here. As for what was narrated from Ibn Umar, may Allah be pleased with him, that he said: "One day I climbed onto the house of my sister Hafsa, and I saw the Messenger of Allah sitting for his need, facing Sham and turning his back to the Kaaba," which is found in Sahih Al-Bukhari 1/68 and Sahih Muslim 1/224, this can be understood as a case of necessity, or that it was before the prohibition, or that the Prophet, peace be upon him, had slightly turned away from the direction of the Qibla, so that the matter was not clear to Ibn Umar. And acting upon the words of the Messenger of Allah, peace be upon him, is more appropriate than acting upon the words of a companion. See: Bada'i Al-Sana'i, 5/126, and Tabyin Al-Haqaiq, 1/166, and Fath Al-Qadeer, 1/419, and Allah knows best.