fix

src/super_context.ml

@@ -142,7 +142,7 @@ let create
     in
     let cflags = context.ocamlc_cflags in
     let strings l = Strings (l  , Split)  in
-    let string  s = Strings ([s], Split) in
+    let string  s = Strings ([s], Concat) in
     let path    p = Paths   ([p], Split)  in
     let vars =
       [ "-verbose"       , Strings ([] (*"-verbose";*), Concat)