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+Support code for reading and manipulating hashed file storage (where
+each file and directory is associated with a cryptographic hash, for
+corruption-resistant storage and fast comparisons).
+The supported storage formats include darcs hashed pristine, a plain
+filesystem tree and an indexed plain tree (where the index maintains
+hashes of the plain files and directories).
+This requires ghc, haskell-binary, haskell-dataenc, haskell-mmap,
+haskell-transformers, haskell-zlib, and haskell-mtl.
+After uninstalling, run this command to unregister the package from
+the ghc package database: ghc-pkg recache