1 files changed, 14 insertions, 0 deletions
diff --git a/third_party/rust/num-integer/build.rs b/third_party/rust/num-integer/build.rs
new file mode 100644
index 0000000000..15590bbc12
--- /dev/null
+++ b/third_party/rust/num-integer/build.rs
@@ -0,0 +1,14 @@
+extern crate autocfg;
+
+use std::env;
+
+fn main() {
+    let ac = autocfg::new();
+    if ac.probe_type("i128") {
+        println!("cargo:rustc-cfg=has_i128");
+    } else if env::var_os("CARGO_FEATURE_I128").is_some() {
+        panic!("i128 support was not detected!");
+    }
+
+    autocfg::rerun_path(file!());
+}