Re: [Haskell-cafe] Can't cabal install readline

On Fri, Dec 5, 2008 at 2:08 PM, Judah Jacobson wrote:

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Hello,

This week I upgraded to GHC 6.10 using the .pkg installer. It installed without a single hiccup -- thanks!

I've noticed two odd things: the standard library haddock that comes with the installer doesn't have links to the hs-coloured sources anymore (and neither does the online documentation); I miss that a lot. I also can't Ctrl+R anymore in GHCi to search my command history. But I can learn to

On Fri, Dec 5, 2008 at 1:10 PM, Martijn van Steenbergen wrote: live

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without those.

The following instructions should re-enable Ctrl-R:

http://mult.ifario.us/p/editrc-tidbit-for-ghci

...

Another minor inconvenience is that the packages I had installed (using cabal) are no longer available to GHC -- I think I will have to reinstall them. But I cannot continue working on my Yogurt project anymore, because it depends on readline, which fails to build:

<snip> checking for rl_readline_version... yes checking for rl_begin_undo_group... no configure: error: readline not found, so this package cannot be built See `config.log' for more details. cabal: Error: some packages failed to install: Yogurt-0.2 depends on readline-1.0.1.0 which failed to install. readline-1.0.1.0 failed during the configure step. The exception was: exit: ExitFailure 1

The above happens because GHC is using the OS X default installation of libreadline.a which is actually a link to libedit that doesn't implement the full readline API.

If you already have the MacPorts readline, you just need to tell cabal where it is, with (for example)

cabal install readline --extra-include-dirs=/opt/local/include --extra-lib-dirs=/opt/local/lib

If you'd like, you can add /opt/local/include to your shell's INCLUDE_PATH and/or C_INCLUDE_PATH environment variables and /opt/local/lib to your LIBRARY_PATH and/or LD_LIBRARY_PATH variables. I say "and/or" because I don't know which one is actually necessary, but if you add it to both you'll be safe. - Phil

-Judah _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe