-LIB_REFS = System System.Xml System.Web System.Windows.Forms System.Drawing Accessibility System.Data System.Configuration
-LIB_MCS_FLAGS = -r:$(corlib)
+LIB_REFS = System System.Xml plainweb/System.Web System.Windows.Forms System.Drawing Accessibility System.Data System.Configuration
+LIB_MCS_FLAGS = -nowarn:436 -nowarn:612,618,649,67,672