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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">That’s (2), thanks. How about (1)?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Sebastian Graf <sgraf1337@gmail.com>
<br>
<b>Sent:</b> 30 March 2021 14:22<br>
<b>To:</b> Simon Peyton Jones <simonpj@microsoft.com><br>
<b>Cc:</b> ghc-devs@haskell.org<br>
<b>Subject:</b> Re: Multiple versions of happy<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm">
Hi Simon,<o:p></o:p></p>
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<o:p> </o:p></p>
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According to the configure script, you can use the HAPPY env variable. e.g.<o:p></o:p></p>
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<o:p> </o:p></p>
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$ HAPPY=/full/path/to/happy ./configure<o:p></o:p></p>
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<o:p> </o:p></p>
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Hope that helps. Cheers,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm">
Sebastian<o:p></o:p></p>
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<o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm">
Am Di., 30. März 2021 um 15:19 Uhr schrieb Simon Peyton Jones via ghc-devs <<a href="mailto:ghc-devs@haskell.org">ghc-devs@haskell.org</a>>:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">What’s the approved mechanism to install multiple versions of happy/alex etc? Eg I tried to build ghc-9.0 and got this:<o:p></o:p></p>
<p class="gmail-m1453297172406546814code">checking for makeinfo... no<o:p></o:p></p>
<p class="gmail-m1453297172406546814code">checking for python3... /usr/bin/python3<o:p></o:p></p>
<p class="gmail-m1453297172406546814code">checking for ghc-pkg matching /opt/ghc/bin/ghc... /opt/ghc/bin/ghc-pkg<o:p></o:p></p>
<p class="gmail-m1453297172406546814code">checking for happy... /home/simonpj/.cabal/bin/happy<o:p></o:p></p>
<p class="gmail-m1453297172406546814code">checking for version of happy... 1.20.0<o:p></o:p></p>
<p class="gmail-m1453297172406546814code">configure: error: Happy version 1.19 is required to compile GHC.<o:p></o:p></p>
<p class="gmail-m1453297172406546814code"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I so I have to<o:p></o:p></p>
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<li class="gmail-m1453297172406546814msolistparagraph" style="mso-list:l0 level1 lfo1">
Install happy-1.19 without overwriting the installed happy-1.20<o:p></o:p></li><li class="gmail-m1453297172406546814msolistparagraph" style="mso-list:l0 level1 lfo1">
Tell configure to use happy-1.19<o:p></o:p></li></ol>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">What’s the best way to do those two things?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Simon<o:p></o:p></p>
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<p class="MsoNormal">_______________________________________________<br>
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