Finished adding a basic flake

It can now build the Linux C2 beacon

nl-sys/Cargo.toml

@@ -10,4 +10,5 @@ libc = "0.2.142"
 
 [build-dependencies]
 autotools = "0.2"
-cc = "1.0"
+cc = "1.0"
+fs_extra = "1.3.0"

nl-sys/build.rs

@@ -13,10 +13,18 @@
 // 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/>.
 
+use fs_extra::dir::{copy, CopyOptions};
+
 fn main() -> std::io::Result<()> {
     cc::Build::new().file("src/bridge.c").compile("bridge");
 
-    let dst = autotools::Config::new("libnl").reconf("-vi").build();
+    let libnl_src = format!("{}/libnl_src", std::env::var("OUT_DIR").unwrap());
+
+    let mut options = CopyOptions::new();
+    options.copy_inside = true;
+    copy(std::env!("SPARSE_BUILD_LIBNL"), &libnl_src, &options);
+
+    let dst = autotools::Config::new(libnl_src).reconf("-vi").build();
 
     println!("cargo:rustc-link-search=native={}/lib", dst.display());
     println!("cargo:rustc-link-lib=static=nl-3");