found 7zip in C:\Program Files\7-Zip\7z.exe
	cd nuget
	nuget pack GDAL.nuspec -version 
NuGet.CommandLine.CommandLineException: Missing option value for: '-version'
   at NuGet.CommandLine.CommandLineParser.ExtractOptions(ICommand command, IEnumerator`1 argsEnumerator)
   at NuGet.CommandLine.CommandLineParser.ParseCommandLine(IEnumerable`1 commandLineArgs)
   at NuGet.CommandLine.Program.MainCore(String workingDirectory, String[] args)