 
 let package = Package(
   name: "OpenSpiel",
+  platforms: [.macOS(.v10_13)],
   products: [
     .library(
       name: "OpenSpiel",

// swift-tools-version:4.2
// The swift-tools-version declares the minimum version of Swift required to build this package.

// Copyright 2019 DeepMind Technologies Ltd. All rights reserved.

      targets: ["TexasHoldemBenchmark"]),
  ],
  dependencies: [
    .package(name: "Benchmark", url: "https://github.com/google/swift-benchmark.git", .branch("master")),
  ],
  targets: [
    .target(
