Add a note about Cabal's parsec flag

phadej · phadej · commit 455378ee37e7 · 2017-01-19T20:15:29.000+02:00
diff --git a/cabal-install/cabal-install.cabal b/cabal-install/cabal-install.cabal
@@ -201,7 +201,7 @@ Flag debug-tracetree
   default:      False
 
 flag parsec
-  description:  Use parsec parser
+  description:  Use parsec parser. This requires 'Cabal' library built with its parsec flag enabled.
   default:      False
   manual:       True
 
