Dear Chaeyeon,
Thanks for the post and welcome to the ROOT Community!
I am sorry to read ROOT did not work out of the box on your platform.
ROOT 6.32.06 supports macOS15, it was one of the main reasons to release it, and it’s regularly running on our CI, building from scratch, on that very platform (there we use M2 cpus, but we verified on other nodes that it runs and tests successfully on Intel Core i7 cpus).
Could you please have a look to this post (ROOT on macOS 15 / Xcode 16 - #8 by Danilo) and subsequent to see whether you are affected by the same issue, i.e. somthing related to the Command Line Tools?
Best,
Danilo