--- build/config/rust.gni.orig	2022-05-19 05:17:34 UTC
+++ build/config/rust.gni
@@ -116,7 +116,7 @@ if (enable_rust) {
     rust_sysroot = "//third_party/rust-toolchain"
     use_unverified_rust_toolchain = false
   } else {
-    if (host_os != "linux") {
+    if (host_os != "linux" && host_os != "openbsd" && host_os != "freebsd") {
       assert(false,
              "Attempt to use Android Rust toolchain on an unsupported platform")
     }