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diff --git a/third_party/rust/glean-core/src/system.rs b/third_party/rust/glean-core/src/system.rs
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+// Copyright (c) 2017 The Rust Project Developers
+// Copyright (c) 2018-2020 The Rust Secure Code Working Group
+// Licensed under the MIT License.
+// Original license:
+// https://github.com/rustsec/rustsec/blob/2a080f173ad9d8ac7fa260f0a3a6aebf0000de06/platforms/LICENSE-MIT
+//
+// Permission is hereby granted, free of charge, to any
+// person obtaining a copy of this software and associated
+// documentation files (the "Software"), to deal in the
+// Software without restriction, including without
+// limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software
+// is furnished to do so, subject to the following
+// conditions:
+//
+// The above copyright notice and this permission notice
+// shall be included in all copies or substantial portions
+// of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+//! Detect and expose `target_os` as a constant.
+//!
+//! Code adopted from the "platforms" crate: <https://github.com/rustsec/rustsec/tree/2a080f173ad9d8ac7fa260f0a3a6aebf0000de06/platforms>.
+
+#[cfg(target_os = "android")]
+/// `target_os` when building this crate: `android`
+pub const OS: &str = "Android";
+
+#[cfg(target_os = "ios")]
+/// `target_os` when building this crate: `ios`
+pub const OS: &str = "iOS";
+
+#[cfg(target_os = "linux")]
+/// `target_os` when building this crate: `linux`
+pub const OS: &str = "Linux";
+
+#[cfg(target_os = "macos")]
+/// `target_os` when building this crate: `macos`
+pub const OS: &str = "Darwin";
+
+#[cfg(target_os = "windows")]
+/// `target_os` when building this crate: `windows`
+pub const OS: &str = "Windows";
+
+#[cfg(target_os = "freebsd")]
+/// `target_os` when building this crate: `freebsd`
+pub const OS: &str = "FreeBSD";
+
+#[cfg(target_os = "netbsd")]
+/// `target_os` when building this crate: `netbsd`
+pub const OS: &str = "NetBSD";
+
+#[cfg(target_os = "openbsd")]
+/// `target_os` when building this crate: `openbsd`
+pub const OS: &str = "OpenBSD";
+
+#[cfg(target_os = "solaris")]
+/// `target_os` when building this crate: `solaris`
+pub const OS: &str = "Solaris";
+
+#[cfg(not(any(
+    target_os = "android",
+    target_os = "ios",
+    target_os = "linux",
+    target_os = "macos",
+    target_os = "windows",
+    target_os = "freebsd",
+    target_os = "netbsd",
+    target_os = "openbsd",
+    target_os = "solaris",
+)))]
+pub const OS: &str = "Unknown";