Split cxx runtime and build components
diff --git a/demo-rs/build.rs b/demo-rs/build.rs
index 71def71..edbb281 100644
--- a/demo-rs/build.rs
+++ b/demo-rs/build.rs
@@ -1,6 +1,5 @@
 fn main() {
-    cxx::Build::new()
-        .bridge("src/main.rs")
+    cxx_build::bridge("src/main.rs")
         .file("../demo-cxx/demo.cc")
         .flag("-std=c++11")
         .compile("cxxbridge-demo");