Resolving dependencies...
Downloading directory-tree-0.1...
Configuring directory-tree-0.1...
Building directory-tree-0.1...
Preprocessing library directory-tree-0.1...

System/Directory/Tree.hs:68:8:
    Could not find module `System.FilePath'
    It is a member of the hidden package `filepath-1.3.0.1'.
    Perhaps you need to add `filepath' to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.
Failed to install directory-tree-0.1
cabal: Error: some packages failed to install:
directory-tree-0.1 failed during the building phase. The exception was:
ExitFailure 1