Hello. http://www.haskell.org/cabal/users-guide/developing-packages.html#package-de... {{{ manual: boolean (default: False) By default, Cabal will first try to satisfy dependencies with the default flag value and then, if that is not possible, with the negated value. However, if the flag is manual, then the default value (which can be overridden by commandline flags) will be used. }}} Can I interpret this as {{{ First, Cabal tries to satisfy dependencies with the default flag value. Second, if the flag is manual, Cabal tries to satisfy dependencies with the negated flag value. }}} ? {{{ This file should contain of a number global property descriptions and several sections. }}} Maybe it's my English, but I can only think of "descriptions of global properties of a number" which does not make sense.