include the sdk dir

Change-Id: Ideb1e22fc926d0be3a9ee5c7336de8bf37b7014f
Reviewed-on: https://fuchsia-review.googlesource.com/c/fargo/+/551163
Reviewed-by: Marc Khouri <mnck@google.com>
diff --git a/src/package.rs b/src/package.rs
index 3a46dce..a36a6ae 100644
--- a/src/package.rs
+++ b/src/package.rs
@@ -162,6 +162,7 @@
 
     let cmc = cmc_path(fuchsia_config)?;
     let fuchsia_dir = &fuchsia_dir()?;
+    let sdk_dir = fuchsia_dir.join("sdk").join("lib");
 
     let output = Command::new(cmc)
         .arg("include")
@@ -169,7 +170,7 @@
         .arg("--output")
         .arg(&destination_path)
         .arg("--includepath")
-        .arg(&fuchsia_dir)
+        .arg(&sdk_dir)
         .arg("--includeroot")
         .arg(&fuchsia_dir)
         .output()