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diff --git a/third_party/rust/clap_builder/src/lib.rs b/third_party/rust/clap_builder/src/lib.rs
new file mode 100644
index 0000000000..7d49d41dfa
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+++ b/third_party/rust/clap_builder/src/lib.rs
@@ -0,0 +1,66 @@
+// Copyright ⓒ 2015-2016 Kevin B. Knapp and [`clap-rs` contributors](https://github.com/clap-rs/clap/graphs/contributors).
+// Licensed under the MIT license
+// (see LICENSE or <http://opensource.org/licenses/MIT>) All files in the project carrying such
+// notice may not be copied, modified, or distributed except according to those terms.
+
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![doc = include_str!("../README.md")]
+#![doc(html_logo_url = "https://raw.githubusercontent.com/clap-rs/clap/master/assets/clap.png")]
+#![warn(
+    missing_docs,
+    missing_debug_implementations,
+    missing_copy_implementations,
+    trivial_casts,
+    unused_allocation,
+    trivial_numeric_casts,
+    clippy::single_char_pattern
+)]
+#![forbid(unsafe_code)]
+// Wanting consistency in our calls
+#![allow(clippy::write_with_newline)]
+// Gets in the way of logging
+#![allow(clippy::let_and_return)]
+// HACK https://github.com/rust-lang/rust-clippy/issues/7290
+#![allow(clippy::single_component_path_imports)]
+#![allow(clippy::branches_sharing_code)]
+// Doesn't allow for debug statements, etc to be unique
+#![allow(clippy::if_same_then_else)]
+// Breaks up parallelism that clarifies intent
+#![allow(clippy::collapsible_else_if)]
+
+#[cfg(not(feature = "std"))]
+compile_error!("`std` feature is currently required to build `clap`");
+
+pub use crate::builder::ArgAction;
+pub use crate::builder::Command;
+pub use crate::builder::ValueHint;
+pub use crate::builder::{Arg, ArgGroup};
+pub use crate::parser::ArgMatches;
+pub use crate::util::color::ColorChoice;
+pub use crate::util::Id;
+
+/// Command Line Argument Parser Error
+///
+/// See [`Command::error`] to create an error.
+///
+/// [`Command::error`]: crate::Command::error
+pub type Error = crate::error::Error<crate::error::DefaultFormatter>;
+
+pub use crate::derive::{Args, CommandFactory, FromArgMatches, Parser, Subcommand, ValueEnum};
+
+#[macro_use]
+#[allow(missing_docs)]
+mod macros;
+
+mod derive;
+
+pub mod builder;
+pub mod error;
+pub mod parser;
+
+mod mkeymap;
+mod output;
+mod util;
+
+const INTERNAL_ERROR_MSG: &str = "Fatal internal error. Please consider filing a bug \
+                                  report at https://github.com/clap-rs/clap/issues";