        runnableDebuggingMode: RunnableDebuggingMode = .Default,
        version: String = "1.3",
        explicitTests: [PBXTarget]? = nil,
-       additionalBuildTargets: [(PBXTarget, String)]? = nil) {
+       additionalBuildTargets: [(PBXTarget, String)]? = nil,
+       launchActionEnvVars: [String: String]? = nil) {
     self.version = version
     self.target = target
     self.project = project

    return element
  }


  /// Information about a PBXTarget that may be built.
  class BuildableReference {

  let additionalBuildTargets: [(PBXTarget, String)]?

  let primaryTargetBuildableReference: BuildableReference
  let launchActionEnvVars: [String : String]

  init(target: PBXTarget,
       project: PBXProject,
