cabal-install does not retain the version for happy

StackOverflow https://stackoverflow.com/questions/16535336

  •  29-05-2022
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Question

I've trying to do cabal install hoogle but there is a hickup with the haskell-src-exts-1.13.5 dependency:

Configuring haskell-src-exts-1.13.5...
setup: The program happy version >=1.17 is required but it could not be found.

When I try to do cabal install happy it seems to finish successfully, but cabal-install does not retain the version:

>$ cabal list happy
* happy
    Synopsis: Happy is a parser generator for Haskell
    Default available version: 1.18.10
    Installed versions: [ Unknown ]
    Homepage: http://www.haskell.org/happy/
    License:  BSD3

As you can see the version is [ Unknown ]. It stays unknown, and cabal-install remains oblivious if I try to run cabal install happy again.

What gives?

Thanks in advance!

Was it helpful?

Solution

Looks like cabal does not show Installed versions for executables, but for libraries only.

Maybe cabal install happy somewhere to your home directory, for example in $HOME/.cabal/bin, and it's not in your PATH. cabal install happy show this path in some last lines. So you can add this path to your PATH and try to install haskell-src-exts again.

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