Bug#878468: cabal-debian FTBFS: Failed to load interface for `Text.ParserCombinators.Parsec.Rfc2822'

[Adrian Bunk]

Source: cabal-debian
Version: 4.35.6-2
Severity: serious

Some recent change in unstable makes cabal-debian FTBFS:

https://tests.reproducible-builds.org/debian/history/cabal-debian.html
https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/cabal-debian.html

...
Building cabal-debian-4.35.6...
Preprocessing library cabal-debian-4.35.6...
[ 1 of 30] Compiling System.Git       ( src/System/Git.hs, dist-ghc/build/System/Git.o )
[ 2 of 30] Compiling Paths_cabal_debian ( dist-ghc/build/autogen/Paths_cabal_debian.hs, dist-ghc/build/Paths_cabal_debian.o )
[ 3 of 30] Compiling Distribution.Version.Invert ( src/Distribution/Version/Invert.hs, dist-ghc/build/Distribution/Version/Invert.o )
[ 4 of 30] Compiling Debian.Orphans   ( src/Debian/Orphans.hs, dist-ghc/build/Debian/Orphans.o )

src/Debian/Orphans.hs:30:1: error:
    Failed to load interface for `Text.ParserCombinators.Parsec.Rfc2822'
    Perhaps you meant
      Text.ParserCombinators.Parsec.Char (from parsec-3.1.11)
      Text.ParserCombinators.Parsec.Error (from parsec-3.1.11)
      Text.ParserCombinators.Parsec.Expr (from parsec-3.1.11)
    Use -v to see a list of the files searched for.
/usr/share/cdbs/1/class/hlibrary.mk:147: recipe for target 'build-ghc-stamp' failed
make: *** [build-ghc-stamp] Error 1