That's (2), thanks. How about (1)? From: Sebastian Graf <sgraf1...@gmail.com> Sent: 30 March 2021 14:22 To: Simon Peyton Jones <simo...@microsoft.com> 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 <ghc-devs@haskell.org<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 _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org<mailto:ghc-devs@haskell.org> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmail.haskell.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fghc-devs&data=04%7C01%7Csimonpj%40microsoft.com%7Cb7e07fe78b644f0181be08d8f37ec03c%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637527073028872686%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=t3W8rl8mUbjPmEXYzcjzDYm1IiSjCDZNb7ATmz%2Fil28%3D&reserved=0>
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