feat: tested nl-sys, and it links

nl-sys/build.rs

@@ -0,0 +1,30 @@
+// Copyright (C) 2025 Andrew Rioux
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+fn main() -> std::io::Result<()> {
+    cc::Build::new()
+        .compiler("clang")
+        .file("src/bridge.c")
+        .compile("bridge");
+
+    println!(
+        "cargo:rustc-link-search=native={}/lib",
+        std::env::var("SPARSE_BUILD_LIBNL").unwrap()
+    );
+    println!("cargo:rustc-link-lib=static=nl-3");
+    println!("cargo:rustc-link-lib=static=nl-route-3");
+
+    Ok(())
+}