[MacPorts] #68957: Cabal fails to build on MacOS 10.15

[MacPorts]

#68957: Cabal fails to build on MacOS 10.15
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  Reporter:  Gandoon  |      Owner:  essandess
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:           |   Keywords:
      Port:  cabal    |
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Comment (by Gandoon):

 Replying to [comment:1 kencu]:
 > probably need to see what happened in here:
 >
 > {{{
 >
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_cabal/cabal/work/.home/.cabal/logs/ghc-9.6.3/d25519-0.0.5.0-6c355779.log
 > }}}

 What happens there is just the following:

 {{{
 Configuring library for ed25519-0.0.5.0..
 Preprocessing library for ed25519-0.0.5.0..
 Building library for ed25519-0.0.5.0..
 [1 of 1] Compiling Crypto.Sign.Ed25519 ( src/Crypto/Sign/Ed25519.hs,
 dist/build/Crypto/Sign/Ed25519.o, dist/build/Crypto/Sign/Ed25519.dyn_o )

 <no location info>: error:
     Failed to load interface for ‘Language.Haskell.TH.Syntax’
 There are files missing in the ‘template-haskell’ package,
 try running 'ghc-pkg check'.
 Use -v (or `:set -v` in ghci) to see a list of the files searched for.
 }}}

 And it is not quite clear to me what I can or should do about it.

-- 
Ticket URL: <https://trac.macports.org/ticket/68957#comment:3>
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