Good evening, I'm trying to learn how to implement Haskell on a web site. I've got the O'Reilly book: "Developing Web Applications with Haskell and Yesod". I'd appreciate some guidance in regard to this. I'm having a bit of a problem getting the helloWorld.hs app up and running on Yesod. Thank you On Feb 24, 2014, at 2:30 PM, beginners-request@haskell.org wrote:

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Today's Topics:

1. Failure to install cabal-install. (Derek Mahar) 2. Re: Failure to install cabal-install. (Derek Mahar)

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Message: 1 Date: Mon, 24 Feb 2014 13:20:45 -0500 From: Derek Mahar To: beginners@haskell.org Subject: [Haskell-beginners] Failure to install cabal-install. Message-ID: Content-Type: text/plain; charset="utf-8"

How can I tell the Haskell compiler where to find module Control.Monad.Error? After building GHC 7.6.3 and Haskell Platform 2013.2 on Red Hat Linux 6, I found that 'cabal install cabal-install' fails when it attempts to build library HTTP-4000.2.11 because the Haskell compiler cannot find module Control.Monad.Error.

******************************************************* * Installation completed successfully. * * Programs installed into: * /usr/local/bin * * Now do "cabal update" to initialize the package list * * Additional packages may be found at http://hackage.haskell.org * or via "cabal list <pattern>" * * Use "cabal install <foo>" to install additional packages * ******************************************************* [dmahar@dmahar haskell-platform-2013.2.0.0]$ cabal update Downloading the latest package list from hackage.haskell.org Note: there is a new version of cabal-install available. To upgrade, run: cabal install cabal-install [dmahar@dmahar haskell-platform-2013.2.0.0]$ cabal install cabal-install Resolving dependencies... Configuring HTTP-4000.2.11... Building HTTP-4000.2.11... Preprocessing library HTTP-4000.2.11...

Network/Stream.hs:35:8: Could not find module `Control.Monad.Error' There are files missing in the `mtl-2.1.2' package, try running 'ghc-pkg check'. Use -v to see a list of the files searched for. Failed to install HTTP-4000.2.11 cabal: Error: some packages failed to install: HTTP-4000.2.11 failed during the building phase. The exception was: ExitFailure 1 cabal-install-1.18.0.2 depends on HTTP-4000.2.11 which failed to install.

Thank you,

Derek