public override IEnumerable <string> GetDefineSymbols()
{
foreach (var d in base.GetDefineSymbols())
{
yield return(d);
}
var proj = ParentItem.GetFlavor <AddinProjectFlavor> ();
//TODO: keep in sync with targets. eventually resolve from MSBuild
var cv = proj.AddinRegistry.GetAddin("MonoDevelop.Core").Description.CompatVersion;
yield return("MD_" + cv.Replace('.', '_'));
}