Help understanding a dependency conflict
tsuraan
tsuraan at gmail.com
Fri Jan 7 22:30:00 CET 2011
> Is there a reason you need to make the warning go away?
I'm a haskell newbie, and the build system is telling me I'm doing
something that may break my program. I'd definitely be happier if the
warning weren't there :)
> Maybe your installed version of parsec is built against mtl-1 - parsec
> is a dependency of json.
ghc-pkg doesn't list mtl as a dependency of parsec. I didn't think I
had mtl-1 installed (it's not in my .cabal directory), but now I see
that it's part of the haskell base install. So now I'm wondering why
cabal felt that it needed to install mtl-2 for hslogger, when I
apparently already had mtl-1 installed, and hslogger doesn't list a
version for its mtl dep. Is it because hslogger depends on base >= 4,
while json depends on base >= 3? Does that sound like a probable
cause?
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