[Haskell-beginners] I can't turn-off conreate warning

Hello, Dear List! I want to turn-off concreate warning (but to have all other, and possible to treat them as errors). This warning is about orphans instances. I tried: -Wall -Werror -Wno-warn-orphans also -Wall -Werror -Wno-warn-warn-orphans But GHC does not understand this option. How to achieve this? -- Best regards, Paul