Make backtraces work on Redox, copying Unix implementation #43635
I could change the
Future releases of libbacktrace will probably have that fix.
TLDR: It's one of the weird and ugly things in autotools that seem awful, but does help with portability to various strange systems.
This update seems to add fuchsia as well, so if they decide to implement Rust backtraces they won't run into that (small) issue.