If you say `./configure --help`, you'll get all the flags to ./configure.
Toward the bottom, it says that the HAPPY environment variable can contain the
path to the happy executable. So try
> HAPPY=happy-1.19.8 ./configure
and see where you get. You might need the full path to your installed
h
Friends
I can't build ghc-9.0 because of this:
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.
What is the easiest
