diff --git a/.rules/no-println.yaml b/.rules/no-println.yaml
new file mode 100644
index 0000000..80d2ee1
--- /dev/null
+++ b/.rules/no-println.yaml
@@ -0,0 +1,11 @@
+id: no_println
+message: Do not use println! use `tracing::info`/`tracing::trace`/`tracing::debug` instead
+severity: warning
+language: Rust
+rule:
+  all:
+    - kind: macro_invocation
+    - pattern: println!($$$ITEMS)
+fix: tracing::info!($$$ITEMS)
+ignores:
+  - ./*build.rs
diff --git a/.rules/no-unwrap.yml b/.rules/no-unwrap.yml
new file mode 100644
index 0000000..048d613
--- /dev/null
+++ b/.rules/no-unwrap.yml
@@ -0,0 +1,8 @@
+id: no_unwrap
+message: Do not use unwrap
+description: Do not use unwrap
+severity: warning
+language: Rust
+rule:
+  pattern: $ITEM.unwrap()
+exclude: ./*build.rs
diff --git a/deny.toml b/deny.toml
index ee453ec..1e7ddbc 100644
--- a/deny.toml
+++ b/deny.toml
@@ -88,7 +88,7 @@ ignore = [
 # List of explicitly allowed licenses
 # See https://spdx.org/licenses/ for list of possible licenses
 # [possible values: any SPDX 3.11 short identifier (+ optional exception)].
-allow = ["MIT", "Apache-2.0", "BSD-3-Clause", "ISC", "Unicode-DFS-2016"]
+allow = ["MIT", "Apache-2.0", "BSD-3-Clause", "ISC", "Unicode-DFS-2016", "Zlib"]
 # The confidence threshold for detecting a license from license text.
 # The higher the value, the more closely the license text must be to the
 # canonical license text of a valid SPDX license file.
diff --git a/flake.nix b/flake.nix
index dc8bde4..ff4f96d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -160,34 +160,34 @@
               partitionType = "count";
               cargoExtraArgs = "-p mnn-sys";
             });
-          mnn-lints = sgLib.scan ./.;
-          mnn-asan = let
-            rustPlatform = pkgs.makeRustPlatform {
-              cargo = nightlyToolchain;
-              rustc = nightlyToolchain;
-            };
-          in
-            rustPlatform.buildRustPackage (
-              commonArgs
-              // {
-                inherit src;
-                name = "mnn-leaks";
-                cargoLock = {
-                  lockFile = ./Cargo.lock;
-                  outputHashes = {
-                    "cmake-0.1.50" = "sha256-GM2D7dpb2i2S6qYVM4HYk5B40TwKCmGQnUPfXksyf0M=";
-                  };
-                };
-
-                buildPhase = ''
-                  cargo test --target aarch64-apple-darwin
-                '';
-                RUSTFLAGS = "-Zsanitizer=address";
-                ASAN_OPTIONS = "detect_leaks=1";
-                # MNN_COMPILE = "NO";
-                # MNN_LIB_DIR = "${pkgs.mnn}/lib";
-              }
-            );
+          # mnn-lints = sgLib.scan ./.;
+          # mnn-asan = let
+          #   rustPlatform = pkgs.makeRustPlatform {
+          #     cargo = nightlyToolchain;
+          #     rustc = nightlyToolchain;
+          #   };
+          # in
+          #   rustPlatform.buildRustPackage (
+          #     commonArgs
+          #     // {
+          #       inherit src;
+          #       name = "mnn-leaks";
+          #       cargoLock = {
+          #         lockFile = ./Cargo.lock;
+          #         outputHashes = {
+          #           "cmake-0.1.50" = "sha256-GM2D7dpb2i2S6qYVM4HYk5B40TwKCmGQnUPfXksyf0M=";
+          #         };
+          #       };
+          #
+          #       buildPhase = ''
+          #         cargo test --target aarch64-apple-darwin
+          #       '';
+          #       RUSTFLAGS = "-Zsanitizer=address";
+          #       ASAN_OPTIONS = "detect_leaks=1";
+          #       # MNN_COMPILE = "NO";
+          #       # MNN_LIB_DIR = "${pkgs.mnn}/lib";
+          #     }
+          #   );
         };
         packages =
           rec {
diff --git a/mnn-sys/build.rs b/mnn-sys/build.rs
index 525318b..5eb6364 100644
--- a/mnn-sys/build.rs
+++ b/mnn-sys/build.rs
@@ -111,12 +111,10 @@ fn main() -> Result<()> {
             "cargo:rustc-link-search=native={}",
             install_dir.join("lib").display()
         );
+    } else if let core::result::Result::Ok(lib_dir) = std::env::var("MNN_LIB_DIR") {
+        println!("cargo:rustc-link-search=native={}", lib_dir);
     } else {
-        if let Some(lib_dir) = std::env::var("MNN_LIB_DIR").ok() {
-            println!("cargo:rustc-link-search=native={}", lib_dir);
-        } else {
-            panic!("MNN_LIB_DIR not set while MNN_COMPILE is false");
-        }
+        panic!("MNN_LIB_DIR not set while MNN_COMPILE is false");
     }
 
     mnn_c_build(PathBuf::from(MANIFEST_DIR).join("mnn_c"), &vendor)