Thanks eguiraud, I have one of these new processors and this error appeared to me when compiling from source. I wonder if the community will have a precompiled version for M1 processors ready to download in near future.
Best regards,
Jose A.
Edit: For me worked cmake -Dimt=OFF -Dbuiltin_tbb=OFF path-to-source inside the build directory, then cmake --build ., everything seems fine. Sourcing thisroot.sh completes the set up.