These duplicate entries were causing build failures at the fetch stage.
=> lens-5.3.5/lens-5.3.5.tar.gz doesn't seem to exist in /portdistfiles/cabal. => Attempting to fetch https://hackage.haskell.org/package/lens-5.3.5/lens-5.3.5.tar.gz fetch: lens-5.3.5/lens-5.3.5.tar.gz is not a directory => Attempting to fetch http://hackage.haskell.org/package/lens-5.3.5/lens-5.3.5.tar.gz fetch: lens-5.3.5/lens-5.3.5.tar.gz is not a directory => Attempting to fetch http://distcache.FreeBSD.org/ports-distfiles/cabal/lens-5.3.5/lens-5.3.5.tar.gz fetch: lens-5.3.5/lens-5.3.5.tar.gz is not a directory => Couldn't fetch it - please try to retrieve this => port manually into /portdistfiles/cabal and try again. *** Error code 1