On 12-06-27 11:29 AM, Sjoerd Visscher wrote:
I tried to install reactive-banana. This failed due to a dependency conflict,
and then I noticed there was a newer version of reactive-banana. So I did cabal
update, and tried to install again. But whatever I do, cabal keeps trying to
install fclabels, but fclabels is no longer a dependency of
reactive-banana-0.6.0.0! How can I let cabal forget this dependency?
In
http://hackage.haskell.org/packages/archive/reactive-banana/0.6.0.0/reactive-banana.cabal
:
if flag(UseExtensions)
extensions: TypeFamilies, GADTs, MultiParamTypeClasses,
BangPatterns, TupleSections,
EmptyDataDecls
build-depends: QuickCheck >= 1.2 && < 2.5,
fclabels == 1.1.*,
unordered-containers >= 0.2.1.0 && < 0.3,
hashable == 1.1.*
CPP-options: -DUseExtensions
Recall that the semantics of "if flag" is like Prolog not Pascal: if the
packages under build-depends could be installed, then UseExtensions is
set to true. Unless you manually override.
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