Multiple versions of happy

[Sebastian Graf]

Hi Simon,

According to the configure script, you can use the HAPPY env variable. e.g.

$ HAPPY=/full/path/to/happy ./configure

Hope that helps. Cheers,
Sebastian

Am Di., 30. März 2021 um 15:19 Uhr schrieb Simon Peyton Jones via ghc-devs <
ghc-devs at haskell.org>:

> What’s the approved mechanism to install multiple versions of happy/alex
> etc?  Eg I tried to build ghc-9.0 and got this:
>
> checking for makeinfo... no
>
> checking for python3... /usr/bin/python3
>
> checking for ghc-pkg matching /opt/ghc/bin/ghc... /opt/ghc/bin/ghc-pkg
>
> checking for happy... /home/simonpj/.cabal/bin/happy
>
> checking for version of happy... 1.20.0
>
> configure: error: Happy version 1.19 is required to compile GHC.
>
>
>
> I so I have to
>
>    1. Install happy-1.19 without overwriting the installed happy-1.20
>    2. Tell configure to use happy-1.19
>
> What’s the best way to do those two things?
>
> Thanks
>
> Simon
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