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@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 > _______________________________________________ > ghc-devs mailing list > ghc-devs@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs >
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