Alloc requires `libc::write` on Redox, so it was added to `liblibc`. Now the `src/liblibc` submodule needs to be updated to include this PR: https://github.com/rust-lang/libc/pull/653
Alloc requires
libc::writeon Redox, so it was added toliblibc. Now thesrc/liblibcsubmodule needs to be updated to include this PR:rust-lang/libc#653