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<p class="MsoNormal"><span lang="EN-US">Friends<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I can’t build ghc-9.0 because of this:<o:p></o:p></span></p>
<p class="Code"><span lang="EN-US">checking for ghc-pkg matching /opt/ghc/bin/ghc... /opt/ghc/bin/ghc-pkg<o:p></o:p></span></p>
<p class="Code"><span lang="EN-US">checking for happy... /home/simonpj/.cabal/bin/happy<o:p></o:p></span></p>
<p class="Code"><span lang="EN-US">checking for version of happy... 1.20.0<o:p></o:p></span></p>
<p class="Code"><span lang="EN-US">configure: error: Happy version 1.19 is required to compile GHC.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">What is the easiest way to fix? I have happy 1.19.8, but it’s not called plain “happy”<o:p></o:p></span></p>
<p class="Code"><span lang="EN-US">bash$ happy-1.19.8 --version<o:p></o:p></span></p>
<p class="Code"><span lang="EN-US">Happy Version 1.19.8 Copyright (c) 1993-1996 Andy Gill, Simon Marlow (c) 1997-2005 Simon Marlow<o:p></o:p></span></p>
<p class="Code"><span lang="EN-US">Happy is a Yacc for Haskell, and comes with ABSOLUTELY NO WARRANTY.<o:p></o:p></span></p>
<p class="Code"><span lang="EN-US">This program is free software; you can redistribute it and/or modify<o:p></o:p></span></p>
<p class="Code"><span lang="EN-US">it under the terms given in the file 'LICENSE' distributed with<o:p></o:p></span></p>
<p class="Code"><span lang="EN-US">the Happy sources.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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