diff --git a/src/main.rs b/src/main.rs
index ca40c1e..83c05af 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,6 +3,7 @@ mod frontend;
 mod literals;
 mod parser;
 mod rtlil;
+mod package;
 
 use std::fs::File;
 use std::io::prelude::*;
diff --git a/src/package.rs b/src/package.rs
new file mode 100644
index 0000000..6d9e840
--- /dev/null
+++ b/src/package.rs
@@ -0,0 +1,22 @@
+use std::collections::BTreeMap;
+use std::path::PathBuf;
+
+struct Package {
+    name: String,
+    path: PathBuf,
+}
+
+struct PackageRegistry {
+    packages: BTreeMap<String, Package>
+}
+
+impl PackageRegistry {
+    fn new() -> Self {
+        let mut packages = BTreeMap::new();
+        packages.insert("builtins".to_string(), Package {
+            name: "builtins".to_string(),
+            path: "./lib/builtins/".into(),
+        });
+        Self { packages }
+    }
+}