diff --git a/Package.pins b/Package.pins
new file mode 100644
index 0000000..8b5013f
--- /dev/null
+++ b/Package.pins
@@ -0,0 +1,12 @@
+{
+  "autoPin": true,
+  "pins": [
+    {
+      "package": "CSDL2",
+      "reason": null,
+      "repositoryURL": "https://github.com/PureSwift/CSDL2.git",
+      "version": "1.0.1"
+    }
+  ],
+  "version": 1
+}
\ No newline at end of file
diff --git a/Package.resolved b/Package.resolved
index 69916f7..58fa175 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -5,9 +5,9 @@
         "package": "CSDL2",
         "repositoryURL": "https://github.com/PureSwift/CSDL2.git",
         "state": {
-          "branch": "master",
+          "branch": null,
           "revision": "a4798aa0174f6661404b9df4ccaf2ba1dc9cc92c",
-          "version": null
+          "version": "1.0.1"
         }
       }
     ]
diff --git a/Package.swift b/Package.swift
index 7a4aac5..8f96f41 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,33 +1,20 @@
-// swift-tools-version:4.0
+// swift-tools-version:3.0.2
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
 
 let package = Package(
     name: "SDL",
-    products: [
-        // Products define the executables and libraries produced by a package, and make them visible to other packages.
-        .library(
-            name: "SDL",
-            targets: ["SDL"]),
-        .executable(
-            name: "SDLDemo",
-            targets: ["SDLDemo"]),
+    targets: [
+                 Target(
+                    name: "SDLDemo",
+                    dependencies: [.Target(name: "SDL")]
+					),
+                 Target(
+                    name: "SDL"
+					)
     ],
     dependencies: [
-        .package(url: "https://github.com/PureSwift/CSDL2.git", .branch("master"))
-    ],
-    targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
-        .target(
-            name: "SDLDemo",
-            dependencies: ["SDL"]),
-        .target(
-            name: "SDL",
-            dependencies: []),
-        .testTarget(
-            name: "SDLTests",
-            dependencies: ["SDL"]),
+        .Package(url: "https://github.com/PureSwift/CSDL2.git", majorVersion: 1)
     ]
 )
diff --git a/Sources/SDL/BitMaskOption.swift b/Sources/SDL/BitMaskOption.swift
index 00e3ca4..839836c 100644
--- a/Sources/SDL/BitMaskOption.swift
+++ b/Sources/SDL/BitMaskOption.swift
@@ -6,14 +6,25 @@
 //
 
 /// Enum represents a bit mask flag / option.
+#if swift(>=4.0)
 public protocol BitMaskOption: RawRepresentable, Hashable where RawValue: FixedWidthInteger {
     
     /// All the cases of the enum.
     static var all: Set<Self> { get }
 }
+#elseif swift(>=3.0.2)
+public protocol BitMaskOption: RawRepresentable, Hashable {
+    
+    associatedtype RawValue: Integer
+    
+    /// All the cases of the enum.
+    static var all: Set<Self> { get }
+}
+#endif
 
+#if swift(>=4.0)
 /// Convert Swift enums for option flags into their raw values OR'd.
-internal extension Collection where Element: BitMaskOption {
+public extension Collection where Element: BitMaskOption {
     
     var flags: Element.RawValue {
         
@@ -21,6 +32,16 @@ internal extension Collection where Element: BitMaskOption {
         get { return reduce(0, { $0 | $1.rawValue }) }
     }
 }
+#elseif swift(>=3.0.2)
+public extension Collection where Iterator.Element: BitMaskOption {
+    
+    var flags: Iterator.Element.RawValue {
+        
+        @inline(__always)
+        get { return reduce(0, { $0 | $1.rawValue }) }
+    }
+}
+#endif
 
 internal extension BitMaskOption {
     
@@ -34,6 +55,10 @@ internal extension BitMaskOption {
     @inline(__always)
     static func from(flags: RawValue) -> Set<Self> {
         
+        #if swift(>=4.0)
         return Self.all.filter({ $0.isContained(in: flags) })
+        #elseif swift(>=3.0.2)
+        return Set(Array(Self.all).filter({ $0.isContained(in: flags) }))
+        #endif
     }
 }
diff --git a/Sources/SDLDemo/main.swift b/Sources/SDLDemo/main.swift
index 3388255..e2a719e 100644
--- a/Sources/SDLDemo/main.swift
+++ b/Sources/SDLDemo/main.swift
@@ -59,7 +59,7 @@ while isRunning {
         
     case SDL_WINDOWEVENT:
         
-        if event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED.rawValue {
+        if event.window.event == UInt8(SDL_WINDOWEVENT_SIZE_CHANGED.rawValue) {
             
             needsDisplay = true
         }
@@ -89,7 +89,7 @@ while isRunning {
     
     // sleep to save energy
     let frameDuration = SDL_GetTicks() - startTime
-    if frameDuration < 1000 / framesPerSecond {
+    if frameDuration < 1000 / UInt32(framesPerSecond) {
         SDL_Delay((1000 / UInt32(framesPerSecond)) - frameDuration)
     }
 }