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when you try to install the library reactie-banana-wx, get the error:

src\CRUD.hs:10:18: Could not find module `Data.Map': It is a member of the hidden package `containers-0.4.0.0'. Perhaps you need to add `containers' to the build-depends in your .cabal file.

installed the command:

cabal install reactive-banana-wx

Please help correct the problem.

HaskellElephant
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Dima
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  • have you tried to install the containers package in a similar way (cabal install containers)? – Random Dev Sep 17 '11 at 14:25
  • @Carsten König: you don't want to do that: `containers` is a boot library of GHC and thus shouldn't be manually upgraded/built. – ivanm Sep 18 '11 at 11:44

1 Answers1

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The advice it offers is sound, if a bit confusing: cabal install hides the step where it produces the .cabal file! Here's how you can do that part explicitly:

cabal unpack reactive-banana-wx
cd reactive-banana-wx-*
gvim *.cabal # or whatever editor you prefer
# follow the instructions given in the error
cabal install
Daniel Wagner
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    And don't forget to contact the maintainer so it can be fixed in the next version :) – hammar Sep 17 '11 at 14:32
  • What do you mean by "hides the step where it produces the `.cabal' file"? The file is part of the tarball! – ivanm Sep 18 '11 at 11:44
  • @ivanm Personally, I use `cabal install` exactly _because_ it hides everything from me! This includes figuring out the right URL to visit to get the tarball, getting the tarball, unpacking it, checking its dependencies and doing this process recursively for any missing ones, configuring it, building it, putting the built library in the right place, telling GHC about the new library... it really does a lot for us. I think it's perfectly fair to call all the things it does "hiding". – Daniel Wagner Sep 18 '11 at 12:57
  • @Daniel Wagner: oh, by "produce" I thought you meant by it *generating* the .cabal file. – ivanm Sep 19 '11 at 00:27