hunk ./debian/rules 6
-	$(SETUP) configure --ghc --prefix=/usr/lib/haskell-packages/ghc6 $(PROFILE_FLAG) -v2 --ghc-options="-D__GHC_PATCHLEVEL__=$(shell ghc --version | sed -n 's/^.*6.8.//p')"
+	$(SETUP) configure --ghc --prefix=/usr/lib/haskell-packages/ghc6 $(PROFILE_FLAG) -v2 --ghc-options="-XPatternSignatures -D__GHC_PATCHLEVEL__=$(shell ghc --version | sed -n 's/^.*6.8.//p')"