anchor.diff:      ==> "PreparePackaging"
       ==> "PackgaeZipDistribution"
       ==> "PackageNuGetDistribution"
  +    ==> "PackageXamarinDistribution"
       ==> "All"
    
   // start build
  
positive.code:     DeleteFile (distributionDir @@ "Readme.txt")
  )
  
  // Dependencies
  "Clean" 
      ==> "CreateAssemblyInfo"
  
negative.code: let nunitPath = toolsDir @@ "NUnit"
  let nugetExecutable = toolsDir @@ "NuGet" @@ "NuGet.exe"
  let mergerExecutable = toolsDir @@ "ILRepack" @@ "ILRepack.exe"
  let xpkgExecutable = toolsDir @@ "xpkg" @@ "xpkg.exe"
  
  // common assembly info properties
  let assemblyVersion = getBuildParamOrDefault "assemblyVersion" "0.0.0.0"
  