* `i686-unknown-freebsd`
* [`x86_64-unknown-bitrig`](https://doc.rust-lang.org/libc/x86_64-unknown-bitrig/libc/)
* [`x86_64-unknown-dragonfly`](https://doc.rust-lang.org/libc/x86_64-unknown-dragonfly/libc/)
+ * `i686-unknown-haiku`
+ * `x86_64-unknown-haiku`
* [`x86_64-unknown-netbsd`](https://doc.rust-lang.org/libc/x86_64-unknown-netbsd/libc/)