anchor.diff:      parameters.OutputPath @@ (symbolsPackageFileName parameters) |> DeleteFile
   
   // create package
  -let private pack parameters nuspecFile =    
  +let private pack parameters nuspecFile =
  +    let properties = 
  +        match parameters.Properties with
  +            | []    -> ""
  +            | lst   -> "-Properties " + 
  +                            (lst
  +                            |> List.map(fun p -> (fst p) + "=\"" + (snd p) + "\"" )
  +                            |> List.fold(fun state p ->  p + ";" + state) ""
  +                            |> (fun s -> s.TrimEnd(';')))
       let args = 
  -        sprintf "pack \"%s\" -Version %s -OutputDirectory \"%s\" %s" 
  +        sprintf "pack \"%s\" -Version %s -OutputDirectory \"%s\" %s %s" 
               (FullName nuspecFile)
               parameters.Version
               (FullName (parameters.OutputPath.TrimEnd('\\').TrimEnd('/')))
               (if parameters.NoPackageAnalysis then "-NoPackageAnalysis" else "")
  -
  +            properties
  +    
       let result = 
           ExecProcess (fun info ->
               info.FileName <- parameters.ToolPath
  
positive.code:       AccessKey = null
        NoPackageAnalysis = false
        PublishTrials = 5
        Publish = false}
  
  let RequireExactly version = sprintf "[%s]" version
  
  
negative.code:       ProjectFile:string;
        Dependencies: (string*string) list;
        PublishTrials: int;
        Publish:bool;
        Properties: list<string*string>
         }
  
  /// NuGet default params  
  let NuGetDefaults() =
  