I'm a bit surprised that Red still seems stuck at 32 bits, like it was last time I saw something about it years ago. What is the roadblock that prevents them from building 64-bit binaries? I guess it must be very hard since otherwise it would have already been fixed.

i think the holdup is the lack of self-hosting. probably the rebol compiler they use can only build 32bit binaries so self-hosting and 64bit support go together.

it's on the milestone for 1.0. and according to the roadmap it's a solid year of work. it's likely not the only thing they want to do for 1.0, but i think self-hosting is a big chunk