Can't open RT 5.7 on Mac

I just downloaded the new v5.7 on my MacBook Pro and it won’t open. It quits unexpectedly , then jumps to a Terminal window and after various warnings, just stops. I’m using Mojave and have never had this problem with RT before.

Any ideas?

Will be rebuilding it soon. Trying to figure out how to add the macOS sdk sysroot in meson to rebuild a library which recently dropped autotools support.

Is it a known problem, then?

Yes, the problem is known.

OK. Thanks. I thought it was me!