diff --git a/Detect/RxVNDetectBarcodesRequest.swift b/Detect/RxVNDetectBarcodesRequest.swift
index 2ade640..fd68630 100644
--- a/Detect/RxVNDetectBarcodesRequest.swift
+++ b/Detect/RxVNDetectBarcodesRequest.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 public final class RxVNDetectBarcodesRequest<T>: RxVNRequest<T> {
     
     public init(symbologies: [VNBarcodeSymbology]) {
diff --git a/Detect/RxVNDetectFaceLandmarksRequest.swift b/Detect/RxVNDetectFaceLandmarksRequest.swift
index f3ef63c..efcc6ce 100644
--- a/Detect/RxVNDetectFaceLandmarksRequest.swift
+++ b/Detect/RxVNDetectFaceLandmarksRequest.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 public final class RxVNDetectFaceLandmarksRequest<T>: RxVNRequest<T> {
     
     public init() {
diff --git a/Detect/RxVNDetectRectanglesRequest.swift b/Detect/RxVNDetectRectanglesRequest.swift
index 289a98b..a4fc523 100644
--- a/Detect/RxVNDetectRectanglesRequest.swift
+++ b/Detect/RxVNDetectRectanglesRequest.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 public final class RxVNDetectRectanglesRequest<T>: RxVNRequest<T> {
     
     public init() {
diff --git a/Detect/RxVNDetectTextRectanglesRequest.swift b/Detect/RxVNDetectTextRectanglesRequest.swift
index 987e7b8..eb06d5c 100644
--- a/Detect/RxVNDetectTextRectanglesRequest.swift
+++ b/Detect/RxVNDetectTextRectanglesRequest.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 public final class RxVNDetectTextRectanglesRequest<T>: RxVNRequest<T> {
     
     public init(reportCharacterBoxes: Bool) {
diff --git a/Detect/VNDetectBarcodesRequest+Rx.swift b/Detect/VNDetectBarcodesRequest+Rx.swift
index d0f1024..fb64e51 100644
--- a/Detect/VNDetectBarcodesRequest+Rx.swift
+++ b/Detect/VNDetectBarcodesRequest+Rx.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 extension Reactive where Base: VNDetectBarcodesRequest {
     
     public static func request<T>(symbologies: [VNBarcodeSymbology]) -> RxVNDetectBarcodesRequest<T> {
diff --git a/Detect/VNDetectFaceLandmarksRequest+Rx.swift b/Detect/VNDetectFaceLandmarksRequest+Rx.swift
index 3930acf..29e194d 100644
--- a/Detect/VNDetectFaceLandmarksRequest+Rx.swift
+++ b/Detect/VNDetectFaceLandmarksRequest+Rx.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 extension Reactive where Base: VNDetectFaceLandmarksRequest {
     
     public static func request<T>() -> RxVNDetectFaceLandmarksRequest<T> {
diff --git a/Detect/VNDetectRectanglesRequest+Rx.swift b/Detect/VNDetectRectanglesRequest+Rx.swift
index bc8a98c..e0045de 100644
--- a/Detect/VNDetectRectanglesRequest+Rx.swift
+++ b/Detect/VNDetectRectanglesRequest+Rx.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 extension Reactive where Base: VNDetectRectanglesRequest {
     
     public static func request<T>() -> RxVNDetectRectanglesRequest<T> {
diff --git a/Detect/VNDetectTextRectanglesRequest+Rx.swift b/Detect/VNDetectTextRectanglesRequest+Rx.swift
index cd6941a..50f609e 100644
--- a/Detect/VNDetectTextRectanglesRequest+Rx.swift
+++ b/Detect/VNDetectTextRectanglesRequest+Rx.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 extension Reactive where Base: VNDetectTextRectanglesRequest {
     
     public static func request<T>(reportCharacterBoxes: Bool) -> RxVNDetectTextRectanglesRequest<T> {
diff --git a/Package.swift b/Package.swift
new file mode 100644
index 0000000..30df20d
--- /dev/null
+++ b/Package.swift
@@ -0,0 +1,30 @@
+// swift-tools-version:5.1
+
+import PackageDescription
+
+let package = Package(
+    name: "RxVision",
+    platforms: [
+        .macOS(.v10_10), .iOS(.v8), // .tvOS(.v9), .watchOS(.v3)
+    ],
+    products: [
+        .library(
+            name: "RxVision",
+            targets: ["RxVision"]),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/ReactiveX/RxSwift.git", from: "5.0.0")
+    ],
+    targets: [
+        .target(
+            name: "RxVision",
+            dependencies: ["RxSwift"], // "RxRelay"],
+            path: "." // Sources
+        ),
+//        .testTarget(
+//            name: "RxVisionTests",
+//            dependencies: ["RxVision"],
+//            path: "Tests"
+//        )
+    ]
+)
diff --git a/Track/RxVNTrackObjectRequest.swift b/Track/RxVNTrackObjectRequest.swift
index 746e3bb..5800a48 100644
--- a/Track/RxVNTrackObjectRequest.swift
+++ b/Track/RxVNTrackObjectRequest.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 public final class RxVNTrackObjectRequest<T>: RxVNRequest<T> {
     
     public init(detectedObjectObservation observation: VNDetectedObjectObservation) {
diff --git a/Track/RxVNTrackRectangleRequest.swift b/Track/RxVNTrackRectangleRequest.swift
index d875c2d..77b6bec 100644
--- a/Track/RxVNTrackRectangleRequest.swift
+++ b/Track/RxVNTrackRectangleRequest.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 public final class RxVNTrackRectangleRequest<T>: RxVNRequest<T> {
     
     public init(rectangleObservation observation: VNRectangleObservation) {
diff --git a/Track/VNTrackObjectRequest+Rx.swift b/Track/VNTrackObjectRequest+Rx.swift
index e908874..5700947 100644
--- a/Track/VNTrackObjectRequest+Rx.swift
+++ b/Track/VNTrackObjectRequest+Rx.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 extension Reactive where Base: VNTrackObjectRequest {
     
     public static func request<T>(detectedObjectObservation observation: VNDetectedObjectObservation) -> RxVNTrackObjectRequest<T> {
diff --git a/Track/VNTrackRectangleRequest+Rx.swift b/Track/VNTrackRectangleRequest+Rx.swift
index bce127a..5624abd 100644
--- a/Track/VNTrackRectangleRequest+Rx.swift
+++ b/Track/VNTrackRectangleRequest+Rx.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 extension Reactive where Base: VNTrackRectangleRequest {
     
     public static func request<T>(rectangleObservation observation: VNRectangleObservation) -> RxVNTrackRectangleRequest<T> {
diff --git a/Vision/RequestCompletion.swift b/Vision/RequestCompletion.swift
index 0da01bc..39ff2c2 100644
--- a/Vision/RequestCompletion.swift
+++ b/Vision/RequestCompletion.swift
@@ -8,7 +8,9 @@
 
 import Vision
 
+@available(iOS 11.0, *)
 typealias _RequestCompletion = (request: VNRequest, error: Error?)
 
+@available(iOS 11.0, *)
 public typealias RequestCompletion<T> = (value: T?, request: VNRequest, error: Error?)
 
diff --git a/Vision/RxVNCoreMLRequest.swift b/Vision/RxVNCoreMLRequest.swift
index 4517dd4..3fa35cc 100644
--- a/Vision/RxVNCoreMLRequest.swift
+++ b/Vision/RxVNCoreMLRequest.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 public final class RxVNCoreMLRequest<T>: RxVNRequest<T> {
     
     public init(model: VNCoreMLModel, imageCropAndScaleOption: VNImageCropAndScaleOption) {
diff --git a/Vision/RxVNRequest.swift b/Vision/RxVNRequest.swift
index 5e85c0d..f2480d0 100644
--- a/Vision/RxVNRequest.swift
+++ b/Vision/RxVNRequest.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 public class RxVNRequest<T> {
     
     private let valueSubject: PublishSubject<T> = PublishSubject<T>()
diff --git a/Vision/RxVNRequestCompletionHandler.swift b/Vision/RxVNRequestCompletionHandler.swift
index 762e0de..562dd61 100644
--- a/Vision/RxVNRequestCompletionHandler.swift
+++ b/Vision/RxVNRequestCompletionHandler.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 final class RxVNRequestCompletionHandler {
     
     typealias Observer = AnyObserver<_RequestCompletion>
diff --git a/Vision/VNCoreMLRequest+Rx.swift b/Vision/VNCoreMLRequest+Rx.swift
index 8ad6517..e2b54e4 100644
--- a/Vision/VNCoreMLRequest+Rx.swift
+++ b/Vision/VNCoreMLRequest+Rx.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 extension Reactive where Base: VNCoreMLRequest {
     
     public static func request<T>(model: VNCoreMLModel, imageCropAndScaleOption: VNImageCropAndScaleOption) -> RxVNCoreMLRequest<T> {
diff --git a/Vision/VNImageRequestHandler+Rx.swift b/Vision/VNImageRequestHandler+Rx.swift
index 3fd909a..2d2f472 100644
--- a/Vision/VNImageRequestHandler+Rx.swift
+++ b/Vision/VNImageRequestHandler+Rx.swift
@@ -9,6 +9,7 @@
 import Vision
 import RxSwift
 
+@available(iOS 11.0, *)
 extension Reactive where Base: VNImageRequestHandler {
     
     public func perform<T>(_ requests: [RxVNRequest<T>], on value: T) throws {
diff --git a/Vision/VNSequenceRequestHandler+Rx.swift b/Vision/VNSequenceRequestHandler+Rx.swift
index 5dfcde0..1afc9cb 100644
--- a/Vision/VNSequenceRequestHandler+Rx.swift
+++ b/Vision/VNSequenceRequestHandler+Rx.swift
@@ -8,7 +8,9 @@
 
 import Vision
 import RxSwift
+import CoreImage
 
+@available(iOS 11.0, *)
 extension Reactive where Base: VNSequenceRequestHandler {
     
     // MARK: - CGImage