anchor.diff:  
   Target "Nuget" (fun _ ->
       for nuspec in !! "src/**/*.nuspec" do
  -        CleanDir workingDir
  -
           let project = Path.GetFileNameWithoutExtension nuspec 
           let projectDir = Path.GetDirectoryName nuspec
           let releaseDir = projectDir @@ @"bin\Release"
           let packages = projectDir @@ "packages.config"
  +        
  +        let workingDir = binDir @@ "build" @@ project
  +        let libDir = workingDir @@ @"lib\net45\"    
  +        CleanDir workingDir        
   
           let pack outputDir =
               NuGetHelper.NuGet
  
positive.code:         let dest = nugetDir @@ destFile
          
          CopyFile dest pkg
  
      CleanDir workingDir
      DeleteDir workingDir
  )
  
  //--------------------------------------------------------------------------------
  
negative.code:                 nuspec
          // pack nuget (with only dll and xml files)
  
          CleanDir libDir
          !! (releaseDir @@ project + ".dll")
          ++ (releaseDir @@ project + ".xml")
          |> CopyFiles libDir
  