?

flake.nix

@@ -8,16 +8,24 @@
     system = "aarch64-darwin";
     pkgs = nixpkgs.legacyPackages.${system};
   in {
-    devShells.${system}.default = pkgs.mkShell {
-      # pkg-config is needed for CMake to "see" the library
-      nativeBuildInputs = [pkgs.pkg-config];
+    # This builds the 'PROCESSOR' library so other projects can find it
+    packages.${system}.default = pkgs.stdenv.mkDerivation {
+      name = "image_processor";
+      src = ./.;
+      nativeBuildInputs = [pkgs.cmake];
       buildInputs = [pkgs.libjpeg_turbo];
+      # This ensures the .dylib and .h files are moved to the right place
+      installPhase = ''
+        mkdir -p $out/lib $out/include
+        cp libPROCESSOR.dylib $out/lib/ || cp libPROCESSOR.a $out/lib/
+        cp *.h $out/include/
+      '';
+    };
 
+    devShells.${system}.default = pkgs.mkShell {
+      buildInputs = [pkgs.libjpeg_turbo];
       shellHook = ''
         export PKG_CONFIG_PATH="${pkgs.libjpeg_turbo.dev}/lib/pkgconfig:$PKG_CONFIG_PATH"
-        export C_INCLUDE_PATH="${pkgs.libjpeg_turbo.dev}/include:$C_INCLUDE_PATH"
-        export LIBRARY_PATH="${pkgs.libjpeg_turbo}/lib:$LIBRARY_PATH"
-        echo "✅ Environment ready: libturbojpeg and pkg-config loaded."
       '';
     };
   };