@aleroot, on a freshly installed 11.1 (20C69) on M1, that command returned "arch: posix_spawnp: bash: Bad CPU type in executable". So, Rosetta is not present in 20C69. One simple check I did is to fire up our older version of our installer where I haven't added arm64 to the optional hostArchitecture in distribution XML. If Rosetta is not installed, the OS will request that I install Rosetta. I can also use a script from Der Flounder and modified it just to check.