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

System/Directory/Tree.hs:67:8:
    Could not find module ‘System.Directory’
    It is a member of the hidden package ‘directory-1.2.2.0@direc_KowvXytSqazBcvN7MGpFtg’.
    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:68:8:
    Could not find module ‘System.FilePath’
    It is a member of the hidden package ‘filepath-1.4.0.0@filep_KsGE6pHE5eZHSN90ZVax6A’.
    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