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    <p>One way is<br>
      <br>
      cabal install happy --program-suffix=-1.19 --constraint='happy
      ^>=1.19'<br>
      cabal install happy --program-suffix=-1.20 --constraint='happy
      ^>=1.20'<br>
      <br>
      happy-1.19 --version<br>
      Happy Version 1.19.12 Copyright (c) 1993-1996 Andy Gill, Simon
      Marlow (c) 1997-2005 Simon Marlow<br>
      <br>
      happy-1.20 --version<br>
      Happy Version 1.20.0 Copyright (c) 1993-1996 Andy Gill, Simon
      Marlow (c) 1997-2005 Simon Marlow<br>
      <br>
      - Oleg<br>
    </p>
    <div class="moz-cite-prefix">On 30.3.2021 16.22, Simon Peyton Jones
      via ghc-devs wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:AM0PR83MB02766B241AAC7386C67E16FAAD7D9@AM0PR83MB0276.EURPRD83.prod.outlook.com">
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      <div class="WordSection1">
        <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>
        <div style="border:none;border-left:solid blue 1.5pt;padding:0cm
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          <div>
            <div style="border:none;border-top:solid #E1E1E1
              1.0pt;padding:3.0pt 0cm 0cm 0cm">
              <p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
                  lang="EN-US"> Sebastian Graf
                  <a class="moz-txt-link-rfc2396E" href="mailto:sgraf1337@gmail.com"><sgraf1337@gmail.com></a>
                  <br>
                  <b>Sent:</b> 30 March 2021 14:22<br>
                  <b>To:</b> Simon Peyton Jones
                  <a class="moz-txt-link-rfc2396E" href="mailto:simonpj@microsoft.com"><simonpj@microsoft.com></a><br>
                  <b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:ghc-devs@haskell.org">ghc-devs@haskell.org</a><br>
                  <b>Subject:</b> Re: Multiple versions of happy<o:p></o:p></span></p>
            </div>
          </div>
          <p class="MsoNormal"><o:p> </o:p></p>
          <div>
            <div>
              <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>
            </div>
            <div>
              <p class="MsoNormal"
style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm"><o:p> </o:p></p>
            </div>
            <div>
              <p class="MsoNormal"
style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm">According
                to the configure script, you can use the HAPPY env
                variable. e.g.<o:p></o:p></p>
            </div>
            <div>
              <p class="MsoNormal"
style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm"><o:p> </o:p></p>
            </div>
            <div>
              <p class="MsoNormal"
style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm">$
                HAPPY=/full/path/to/happy ./configure<o:p></o:p></p>
            </div>
            <div>
              <p class="MsoNormal"
style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm"><o:p> </o:p></p>
            </div>
            <div>
              <p class="MsoNormal"
style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm">Hope
                that helps. Cheers,<o:p></o:p></p>
            </div>
            <div>
              <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>
            </div>
          </div>
          <p class="MsoNormal"
style="mso-margin-top-alt:6.0pt;margin-right:0cm;margin-bottom:6.0pt;margin-left:0cm"><o:p> </o:p></p>
          <div>
            <div>
              <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"
                  moz-do-not-send="true">ghc-devs@haskell.org</a>>:<o:p></o:p></p>
            </div>
            <blockquote style="border:none;border-left:solid #CCCCCC
              1.0pt;padding:0cm 0cm 0cm
              6.0pt;margin-left:4.8pt;margin-right:0cm">
              <div>
                <div>
                  <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>
                  <ol type="1" start="1">
                    <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>
                </div>
              </div>
              <p class="MsoNormal">_______________________________________________<br>
                ghc-devs mailing list<br>
                <a href="mailto:ghc-devs@haskell.org" target="_blank"
                  moz-do-not-send="true">ghc-devs@haskell.org</a><br>
                <a
href="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"
                  target="_blank" moz-do-not-send="true">http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs</a><o:p></o:p></p>
            </blockquote>
          </div>
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      <br>
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      <pre class="moz-quote-pre" wrap="">_______________________________________________
ghc-devs mailing list
<a class="moz-txt-link-abbreviated" href="mailto:ghc-devs@haskell.org">ghc-devs@haskell.org</a>
<a class="moz-txt-link-freetext" href="http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs">http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs</a>
</pre>
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