Make the unpleasant sed one-liner less unpleasant

diff --git a/utils/ghc-cabal/ghc.mk b/utils/ghc-cabal/ghc.mk
index b4b599d..3b4a85c 100644 (file)
--- a/utils/ghc-cabal/ghc.mk
+++ b/utils/ghc-cabal/ghc.mk
@@ -77,7 +77,7 @@ $(GHC_CABAL_DIR)/dist-dummy-ghc/build/dummy-ghc.hs : $(GHC_CABAL_DIR)/ghc.mk $(M
 #   ["PostfixOperators"] ++
        echo 'extensions :: [String]'                                     >> $@
        echo 'extensions ='                                               >> $@
-       sed '/^xFlags/,/]/{/^  (/{s/^[^"]*"/  ["/; s/"[^"]*$$/"] ++/; p}}; d' compiler/main/DynFlags.hs >> $@
+       sed '/^xFlags/,/]/s/^[[:space:]]*([[:space:]]*\("[^"]*"\)[^"]*/  [\1] ++/p;d' compiler/main/DynFlags.hs >> $@
        echo '  []'                                                       >> $@
 
 # We don't build dummy-ghc with Cabal, so we need to pass -package