anchor.diff:  set GdalPackageUrl=%GdalPackageSite%/Download.aspx?file=%GdalPackageName%
   set DownloadDir=download
   set DownloadedPackage=%DownloadDir%\%GdalPackageName%
  +
   set DistributionDir=dist
   set ZipFile=gdal-1-9-0-csharp-win64.zip
  -set InfoZipDir=..\..\..\..\Info-ZIP
  +
  +rem Assume working directory is {ProjectRoot}\external\gdal\packages\win\{#ofBits}
  +set ExternalDir=..\..\..\..
  +set InfoZipDir=%ExternalDir%\Info-ZIP
  +set ProjectRoot=%ExternalDir%\..
  +
  +set DownloadTool=%ProjectRoot%\tools\current\Landis.Tools.DownloadFile.exe
   set UnzipTool=%InfoZipDir%\unzip.exe
  +set ZipTool=%InfoZipDir%\zip.exe
   
   call :download
   call :extract
  
positive.code: )
  
  echo Downloading %GdalPackageName% ...
  set DownloadTool=..\..\..\..\..\tools\current\Landis.Tools.DownloadFile.exe
  %DownloadTool% %GdalPackageUrl% %DownloadedPackage%
  goto :eof
  
  
negative.code: 
  :zipfile
  
  if exist %ZipFile% (
    echo %ZipFile% already exists.
  ) else (
  