Re: [Haskell-cafe] Cabal message problem.

On Thu, Dec 16, 2010 at 2:24 PM, Magicloud Magiclouds wrote:

On Thu, Dec 16, 2010 at 10:55 AM, Ivan Lazar Miljenovic wrote:

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On 16 December 2010 13:35, Magicloud Magiclouds wrote:

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Hi,  I see this kind of information a lot when I using cabal to install package. Or sometimes same packages both exist in global and user space, which is a "shadowed by" message.  How to resolve that? Thanks.

Resolving dependencies... <command line>: cannot satisfy -package Cabal-1.10.0.0:    Cabal-1.10.0.0-9ac678c7f1e4f8dd31bac0e19f600698 is unusable due to missing or recursive dependencies:      process-1.0.1.4-24e3819e5c17aaf49bfec6a0ab739420    (use -v for more information)

This means you built Cabal-1.10.0.0 against process-1.0.1.4, but have subsequently upgraded (or downgraded or uninstalled) process.  As such, rebuild Cabal.

"ghc-pkg check" will give you a list of all broken packages.

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com

The annoying thing is, I did not upgrade Cabal. Cabal and process are now coming with ghc 7. But many cabal packages do not know about this, I am not sure if this is cabal's fault or the packages'. So when installing some packages by cabal, they install the same version of, for example, process again. Then other packages depend on Cabal will give out this error.

-- 竹密岂妨流水过 山高哪阻野云飞

And, sure, I could reinstall Cabal. Then things seem fine. But it is weird. I have to have the same packages installed at two places of the system. -- 竹密岂妨流水过 山高哪阻野云飞