from: github.com/remko/age-plugin-se

Package.swift

@@ -0,0 +1,36 @@
+// swift-tools-version: 5.7
+
+import PackageDescription
+
+// Technically, the dependencies don't need the platform conditional.
+// However, I like to keep the dependencies out of the build entirely on macOS.
+// Unfortunately, this also means Package.resolved isn't stable.
+
+var packageDependencies: [Package.Dependency] {
+  #if os(Linux) || os(Windows)
+    return [.package(url: "https://github.com/apple/swift-crypto.git", "2.0.0"..<"3.0.0")]
+  #else
+    return []
+  #endif
+}
+
+var targetDependencies: [Target.Dependency] {
+  #if os(Linux) || os(Windows)
+    return [
+      .product(
+        name: "Crypto", package: "swift-crypto", condition: .when(platforms: [.linux, .windows]))
+    ]
+  #else
+    return []
+  #endif
+}
+
+let package = Package(
+  name: "AgeSecureEnclavePlugin",
+  platforms: [.macOS(.v13)],
+  dependencies: packageDependencies,
+  targets: [
+    .executableTarget(name: "age-plugin-se", dependencies: targetDependencies, path: "Sources"),
+    .testTarget(name: "Tests", dependencies: ["age-plugin-se"], path: "Tests"),
+  ]
+)