anchor.diff:  
       match existingDepFile with
       | None ->
  -        let nugetSources =
  -            match FindAllFiles(".", "nuget.config") |> Seq.firstOrDefault with
  -            | Some configFile -> 
  -                let sources = readPackageSources(configFile) 
  -                removeFileIfExists configFile.FullName
  -                sources @ [DefaultNugetSource]
  -            | None -> [DefaultNugetSource]
  -            |> Set.ofList
  -            |> Set.toList        
  -        
  -        let packages = packagesToAdd |> List.map (fun (name,v) -> nugetPackageRequirement(name,v,nugetSources))
  +        let packages = packagesToAdd |> List.map (fun (name,v) -> nugetPackageRequirement(name,v,nugetConfig.PackageSources))
           DependenciesFile(Constants.DependenciesFile, InstallOptions.Default, packages, []).Save()
       | Some depFile ->
           if not (packagesToAdd |> List.isEmpty)
  
positive.code:             removeFileIfExists nugetTargets
              let depFile = DependenciesFile.ReadFromFile(Constants.DependenciesFile)
              if not <| depFile.HasPackage("Nuget.CommandLine") then depFile.Add("Nuget.CommandLine", "").Save()
              if initAutoRestore then
                  VSIntegration.InitAutoRestore()
  
          if Directory.EnumerateFileSystemEntries(nugetDir) |> Seq.isEmpty 
              then Directory.Delete nugetDir
      | None -> ()
  
      if installAfter then
          UpdateProcess.Update(true,false,true)
negative.code:     for packagesConfigFile in nugetPackagesConfigs |> Seq.map (fun f -> f.File) do
          removeFileIfExists packagesConfigFile.FullName
  
      let autoVsNugetRestore = nugetConfig.PackageRestoreEnabled && nugetConfig.PackageRestoreAutomatic
      let targetsNugetRestore = FindAllFiles(".", "nuget.targets") |> Seq.isEmpty |> not
  
      match Directory.EnumerateDirectories(".", ".nuget", SearchOption.AllDirectories) |> Seq.firstOrDefault with
      | Some nugetDir ->
          let nugetTargets = Path.Combine(nugetDir, "nuget.targets")
  