Don't hardcode i32 in FFI bindings

diff --git a/src/doc/native-build.md b/src/doc/native-build.md
index 60a169487eeb724178e1475bdcf4e9514778f117..740a4273cc6db25c2320abee05f80d3144ac0938 100644 (file)
--- a/src/doc/native-build.md
+++ b/src/doc/native-build.md
@@ -127,10 +127,11 @@ int foo() { return 1; }
 
 ```rust
 // src/main.rs
+extern crate libc;
 
 #[link(name = "hello", kind = "static")]
 extern {
-    fn foo() -> i32;
+    fn foo() -> libc::c_int;
 }
 
 fn main() {