Add macos target

AppleLibs.xcodeproj/project.pbxproj

@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 52;
+	objectVersion = 54;
 	objects = {
 
 /* Begin PBXBuildFile section */
@@ -543,10 +543,14 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 13.5;
 				MARKETING_VERSION = 1.1;
 				PRODUCT_BUNDLE_IDENTIFIER = de.tobias.AppleLibs;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
+				REGISTER_APP_GROUPS = YES;
 				SKIP_INSTALL = YES;
+				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator macosx";
+				SUPPORTS_MACCATALYST = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
@@ -571,10 +575,14 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 13.5;
 				MARKETING_VERSION = 1.1;
 				PRODUCT_BUNDLE_IDENTIFIER = de.tobias.AppleLibs;
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
+				REGISTER_APP_GROUPS = YES;
 				SKIP_INSTALL = YES;
+				SUPPORTED_PLATFORMS = "iphoneos iphonesimulator macosx";
+				SUPPORTS_MACCATALYST = YES;
 				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};

Package.swift

@@ -4,7 +4,8 @@ import PackageDescription
 let package = Package(
     name: "AppleLibs",
     platforms: [
-        .iOS(.v13)
+        .iOS(.v13),
+        .macOS("13.0")
     ],
     products: [
         .library(