Re: [Haskell-cafe] Hackage dependencies problem.

On 12-11-19 04:45 AM, Ivan Lazar Miljenovic wrote:

On 19 November 2012 18:21, Magicloud Magiclouds wrote:

...

<command line>: cannot satisfy -package Cabal-1.16.0: Cabal-1.16.0-dd0ce1db6fea670a788547ee85411486 is unusable due to missing or recursive dependencies: directory-1.2.0.0-8edf300597b0da609c8eccc9aa6d0cc3 process-1.1.0.2-03ae5757aa509ffbe497f42660cba52c unix-2.6.0.0-4bc27fc415f60036a88211de7cde3e9a (use -v for more information)

What should I do? Why user space directory and process would interrupt Cabal in global space?

It shouldn't.

Can you please give an example of a package that gives you an error like this?

Also, what does "ghc-pkg check" say?

The only thing I can think of is that you're trying to upgrade a package like array, containers, etc.

It does. It has always been. When unioning user and global, user takes precedence: user directory-1.2.0.0 shadows global directory-1.2.0.0 (GHC User's Guide 4.9.4). But look closer: user directory-1.2.0.0-feedbabe... shadows global directory-1.2.0.0-deadbeef... Therefore, if global Cabal-1.16.0 was built against directory-1.2.0.0-deadbeef..., it's a missing dependency for you. See my http://www.vex.net/~trebla/haskell/sicp.xhtml#pigeon Fortunately, shadowing is a sessional property, not a data-loss property. One can say, it's a data-surplus property. To regain working sessions, cut surplus data, add -no-user-package-db to all your ghc and ghci commands. "ghc-pkg check" does not report shadowing. Go straight for "ghc -v". This is what you get for "--reinstall".