Resolving dependencies...
Configuring pandoc-1.9.4.3...
Failed to install pandoc-1.9.4.3
Build log ( /home/builder/.cabal/logs/pandoc-1.9.4.3.log ):
cabal: Entering directory '/tmp/cabal-tmp-9255/pandoc-1.9.4.3'
cabal: Leaving directory '/tmp/cabal-tmp-9255/pandoc-1.9.4.3'
cabal: Error: some packages failed to install:
pandoc-1.9.4.3 failed during the configure step. The exception was:
user error ('/opt/ghc/8.0.2/bin/ghc' exited with an error:

/tmp/cabal-tmp-9255/pandoc-1.9.4.3/dist/setup/setup.hs:10:33: error:
Module
‘Distribution.Simple.GHC’
does not export
‘ghcPackageDbOptions’

/tmp/cabal-tmp-9255/pandoc-1.9.4.3/dist/setup/setup.hs:19:1: error:
Failed to load interface for ‘System.Time’
Perhaps you meant
System.CPUTime (from base-4.9.0.0)
System.Cmd (from process-1.4.2.0)
System.Mem (from base-4.9.0.0)
Use -v to see a list of the files searched for.

/tmp/cabal-tmp-9255/pandoc-1.9.4.3/dist/setup/setup.hs:24:1: error:
Failed to load interface for ‘Data.Default’
Use -v to see a list of the files searched for.
)