Resolving dependencies...
Downloading directory-tree-0.1...
Configuring directory-tree-0.1...
Building directory-tree-0.1...
Failed to install directory-tree-0.1
Build log ( /home/builder/.cabal/logs/directory-tree-0.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-20856/directory-tree-0.1'
Configuring directory-tree-0.1...
Building directory-tree-0.1...
Preprocessing library directory-tree-0.1...
[1 of 1] Compiling System.Directory.Tree ( System/Directory/Tree.hs, dist/build/System/Directory/Tree.o )

System/Directory/Tree.hs:67:1: error:
    Failed to load interface for ‘System.Directory’
    It is a member of the hidden package ‘directory-1.2.6.2’.
    Perhaps you need to add ‘directory’ to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.

System/Directory/Tree.hs:68:1: error:
    Failed to load interface for ‘System.FilePath’
    It is a member of the hidden package ‘filepath-1.4.1.0’.
    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.
cabal: Leaving directory '/tmp/cabal-tmp-20856/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