Resolving dependencies...
Configuring mtl-2.2.1...
Building mtl-2.2.1...
Installed mtl-2.2.1
Configuring regex-base-0.93.2...
Building regex-base-0.93.2...
Installed regex-base-0.93.2
Configuring regex-posix-0.95.2...
Building regex-posix-0.95.2...
Installed regex-posix-0.95.2
Configuring yi-0.2...
Failed to install yi-0.2
Build log ( /home/builder/.cabal/logs/yi-0.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-1617/yi-0.2'
cabal: Leaving directory '/tmp/cabal-tmp-1617/yi-0.2'
cabal: Error: some packages failed to install:
yi-0.2 failed during the configure step. The exception was:
user error ('/opt/ghc/8.0.2/bin/ghc' exited with an error:

/tmp/cabal-tmp-1617/yi-0.2/dist/setup/setup.hs:5:1: error:
Failed to load interface for ‘Distribution.Setup’
Perhaps you meant
Distribution.GetOpt
Distribution.Lex
Distribution.ReadE (from Cabal-1.24.0.0)
Use -v to see a list of the files searched for.
)