Resolving dependencies...
Downloading pandoc-1.3...
Configuring parseargs-0.2.0.8...
Configuring utf8-string-1.0.1.1...
Building parseargs-0.2.0.8...
Building utf8-string-1.0.1.1...
Installed utf8-string-1.0.1.1
Configuring pandoc-1.3...
Failed to install pandoc-1.3
Build log ( /home/builder/.cabal/logs/pandoc-1.3.log ):
cabal: Entering directory '/tmp/cabal-tmp-9739/pandoc-1.3'
cabal: Leaving directory '/tmp/cabal-tmp-9739/pandoc-1.3'
Installed parseargs-0.2.0.8
cabal: Error: some packages failed to install:
Bookshelf-0.1.5 depends on pandoc-1.3 which failed to install.
pandoc-1.3 failed during the configure step. The exception was:
user error ('/opt/ghc/8.0.2/bin/ghc' exited with an error:

/tmp/cabal-tmp-9739/pandoc-1.3/dist/setup/setup.hs:9:1: 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.
)