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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>
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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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0cm 0cm 4.0pt">
<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>
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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>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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