void LoadDefaultToolsets ()
{
Toolsets.Add (new Toolset ("2.0",
ToolLocationHelper.GetPathToDotNetFramework (TargetDotNetFrameworkVersion.Version20)));
Toolsets.Add (new Toolset ("3.0",
ToolLocationHelper.GetPathToDotNetFramework (TargetDotNetFrameworkVersion.Version30)));
Toolsets.Add (new Toolset ("3.5",
ToolLocationHelper.GetPathToDotNetFramework (TargetDotNetFrameworkVersion.Version35)));
#if NET_4_0
Toolsets.Add (new Toolset ("4.0",
ToolLocationHelper.GetPathToDotNetFramework (TargetDotNetFrameworkVersion.Version40)));
#endif
}