https://buildd.debian.org/status/package.php?p=haskell-ghc-events

...
hlibrary.setup: Encountered missing or private dependencies:
base >=4.7 && <4.15

 at /usr/share/perl5/Debian/Debhelper/Buildsystem/Haskell/Recipes.pm line 107.
	Debian::Debhelper::Buildsystem::Haskell::Recipes::run_quiet("debian/hlibrary.setup", "configure", "--ghc", "-v2", "--package-db=/var/lib/ghc/package.conf.d", "--prefix=/usr", "--libdir=/usr/lib/haskell-packages/ghc/lib", "--libexecdir=/usr/lib", ...) called at /usr/share/perl5/Debian/Debhelper/Buildsystem/Haskell/Recipes.pm line 131
	Debian::Debhelper::Buildsystem::Haskell::Recipes::run("debian/hlibrary.setup", "configure", "--ghc", "-v2", "--package-db=/var/lib/ghc/package.conf.d", "--prefix=/usr", "--libdir=/usr/lib/haskell-packages/ghc/lib", "--libexecdir=/usr/lib", ...) called at /usr/share/perl5/Debian/Debhelper/Buildsystem/Haskell/Recipes.pm line 620
	Debian::Debhelper::Buildsystem::Haskell::Recipes::configure_recipe() called at -e line 1
make: *** [/usr/share/cdbs/1/class/hlibrary.mk:153: build-ghc-stamp] Error 25

We believe that the bug you reported is fixed in the latest version of
haskell-ghc-events, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1014010@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Ilias Tsitsimpis <iliastsi@debian.org> (supplier of updated haskell-ghc-events package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 18 Jul 2022 19:35:50 +0300
Source: haskell-ghc-events
Architecture: source
Version: 0.17.0.3-1
Distribution: unstable
Urgency: medium
Maintainer: Debian Haskell Group <pkg-haskell-maintainers@lists.alioth.debian.org>
Changed-By: Ilias Tsitsimpis <iliastsi@debian.org>
Closes: 1014010
Changes:
 haskell-ghc-events (0.17.0.3-1) unstable; urgency=medium
 .
   * New upstream release (Closes: #1014010)
   * Declare compliance with Debian policy 4.6.1
   * Remove retired developer, Joachim Breitner, from Uploaders.
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