If you say `./configure --help`, you'll get all the flags to ./configure. Toward the bottom, it says that the HAPPY environment variable can contain the path to the happy executable. So try

HAPPY=happy-1.19.8 ./configure

and see where you get. You might need the full path to your installed happy-1.19.8. It might also be possible to pass --with-happy=/full/path/to/happy-19.8 as an argument. Richard

On Feb 3, 2021, at 7:03 PM, Simon Peyton Jones via ghc-devs wrote:

Friends

I can’t build ghc-9.0 because of this:

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. What is the easiest way to fix? I have happy 1.19.8, but it’s not called plain “happy”

bash$ happy-1.19.8 --version Happy Version 1.19.8 Copyright (c) 1993-1996 Andy Gill, Simon Marlow (c) 1997-2005 Simon Marlow Happy is a Yacc for Haskell, and comes with ABSOLUTELY NO WARRANTY. This program is free software; you can redistribute it and/or modify it under the terms given in the file 'LICENSE' distributed with the Happy sources. Thanks

Simon

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