diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c4a847d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/result
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..489c408
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,26 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1742335908,
+        "narHash": "sha256-unmSiGsXmUAZ4fAcSgf1iwssLmt/FLrczhLAsosyLh8=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "fb9a9ddebc6c9685d2b6b98b35f134573e1872c8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index cb299c4..419251b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,15 +1,20 @@
 {
-  description = "A very basic flake";
+  description = "Calibre Plugins";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    nixpkgs.url = "github:nixos/nixpkgs";
   };
 
   outputs =
     { self, nixpkgs }:
+    let
+      systems = [ "x86_64-linux" ];
+      forEachSystem = nixpkgs.lib.genAttrs systems;
+      pkgsForEach = nixpkgs.legacyPackages;
+    in
     {
-
-      packages.x86_64-linux.default = nixpkgs.legacyPackages.x86_64-linux.callPackage ./package.nix { };
-
+      packages = forEachSystem (system: {
+        acsm-calibre-plugin = pkgsForEach.${system}.callPackage ./packages/acsm-calibre-plugin { };
+      });
     };
 }
diff --git a/package.nix b/package.nix
deleted file mode 100644
index 7f7f21b..0000000
--- a/package.nix
+++ /dev/null
@@ -1,31 +0,0 @@
-{
-  stdenv,
-  fetchFromGitHub,
-  python312Packages,
-  zip,
-  ...
-}:
-stdenv.mkDerivation {
-  name = "acsm-calibre-plugin";
-
-  src = fetchFromGitHub {
-    owner = "Leseratte10";
-    repo = "acsm-calibre-plugin";
-    rev = "97e6ddc1f13024c4406f2a6f2af1d9bca259fa84";
-    hash = "sha256-uVPs6hgpIrWywcFkbSsGoIA4ZpBBk96zbNVhU4MsJ/Y=";
-  };
-
-  buildInputs = [
-    python312Packages.oscrypto
-    python312Packages.asn1crypto
-    zip
-  ];
-
-  buildPhase = ''
-    zip calibre-plugin/oscrypto.zip ${python312Packages.oscrypto}/lib/python3.12/site-packages/oscrypto
-    zip calibre-plugin/asn1crypto.zip ${python312Packages.asn1crypto}/lib/python3.12/site-packages/asn1crypto
-    ls -la > $out
-    bash ./bundle_calibre_plugin.sh
-    cp calibre-plugin.zip $out
-  '';
-}
diff --git a/packages/acsm-calibre-plugin/default.nix b/packages/acsm-calibre-plugin/default.nix
new file mode 100644
index 0000000..aff1465
--- /dev/null
+++ b/packages/acsm-calibre-plugin/default.nix
@@ -0,0 +1,49 @@
+{
+  stdenv,
+  fetchFromGitHub,
+  zip,
+  unzip,
+  fetchurl,
+  openssl_3,
+  ...
+}:
+let
+  oscrypto = fetchurl {
+    url = "https://github.com/Leseratte10/acsm-calibre-plugin/releases/download/config/oscrypto_1.3.0_fork_2023-12-19.zip";
+    hash = "sha256-D872/kQemxB2D7yUSuCIreAMGJOc9V7PtVommZPlwxc=";
+  };
+  asn1crypto = fetchurl {
+    url = "https://github.com/Leseratte10/acsm-calibre-plugin/releases/download/config/asn1crypto_1.5.1.zip";
+    hash = "sha256-f0Wtf5qLAtuPqQ80uOfWtV4grf5CChRL3fcjkMSmEFA=";
+  };
+in
+stdenv.mkDerivation {
+  name = "acsm-calibre-plugin";
+
+  src = fetchFromGitHub {
+    owner = "Leseratte10";
+    repo = "acsm-calibre-plugin";
+    rev = "97e6ddc1f13024c4406f2a6f2af1d9bca259fa84";
+    hash = "sha256-uVPs6hgpIrWywcFkbSsGoIA4ZpBBk96zbNVhU4MsJ/Y=";
+  };
+
+  buildInputs = [
+    zip
+    unzip
+    openssl_3
+  ];
+
+  buildPhase = ''
+    set -e
+    
+    cp ${asn1crypto} calibre-plugin/asn1crypto.zip
+    cp ${oscrypto} calibre-plugin/oscrypto.zip
+
+    substituteInPlace ./calibre-plugin/__init__.py \
+        --replace-fail "libcrypto_path = os.getenv(\"ACSM_LIBCRYPTO\", None)" "libcrypto_path = \"${openssl_3.out}/lib/libcrypto.so\"" \
+        --replace-fail "libssl_path = os.getenv(\"ACSM_LIBSSL\", None)" "libssl_path = \"${openssl_3.out}/lib/libssl.so\""
+
+    bash ./bundle_calibre_plugin.sh
+    cp calibre-plugin.zip $out
+  '';
+}