diff --git a/Package.swift b/Package.swift
index 279f319766..873158d453 100644
--- a/Package.swift
+++ b/Package.swift
@@ -3,6 +3,39 @@ import PackageDescription
 
 let package = Package(
   name: "Lottie",
-  platforms: [.iOS("11.0"), .macOS("10.10"), .tvOS("11.0")],
-  products: [.library(name: "Lottie", targets: ["Lottie"])],
-  targets: [.target(name: "Lottie", path: "Sources")])
\ No newline at end of file
+  platforms: [
+    .iOS("11.0"),
+    .macOS("10.10"),
+    .tvOS("11.0")
+  ],
+  products: [
+    .library(
+        name: "Lottie",
+        targets: ["Lottie"]
+    )
+  ],
+  targets: [
+    .target(
+        name: "Lottie",
+        path: "Sources",
+        cSettings: [
+            .define(
+                "SWIFT_OPTIMIZATION_LEVEL",
+                to: "-O"
+            ),
+            .define(
+                "SWIFT_COMPILATION_MODE",
+                to: "wholemodule"
+            )
+        ]
+    )
+  ]
+)
+
+//:configuration = Debug
+//:completeSettings = none
+
+
+//:configuration = Debug
+//SWIFT_OPTIMIZATION_LEVEL = -O
+//SWIFT_COMPILATION_MODE = wholemodule