yacc, ncgg; platform ncg builds now.

first/yacc.lua

@@ -20,4 +20,25 @@ definerule("yacc",
 	end
 )
 
+definerule("flex",
+	{
+		srcs = { type="targets" },
+		commands = {
+			type="strings",
+			default={
+				"flex -s -t %{ins} > %{outs[1]}"
+			}
+		}
+	},
+	function (e)
+		return normalrule {
+			name = e.name,
+			cwd = e.cwd,
+			ins = e.srcs,
+			outleaves = { "lex.yy.c" },
+			label = e.label,
+			commands = e.commands
+		}
+	end
+)