One way is cabal install happy --program-suffix=-1.19 --constraint='happy ^>=1.19' cabal install happy --program-suffix=-1.20 --constraint='happy ^>=1.20' happy-1.19 --version Happy Version 1.19.12 Copyright (c) 1993-1996 Andy Gill, Simon Marlow (c) 1997-2005 Simon Marlow happy-1.20 --version Happy Version 1.20.0 Copyright (c) 1993-1996 Andy Gill, Simon Marlow (c) 1997-2005 Simon Marlow - Oleg On 30.3.2021 16.22, Simon Peyton Jones via ghc-devs wrote:

That’s (2), thanks.  How about (1)?

 

*From:*Sebastian Graf *Sent:* 30 March 2021 14:22 *To:* Simon Peyton Jones *Cc:* ghc-devs@haskell.org *Subject:* Re: Multiple versions of happy

 

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 mailto:ghc-devs@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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