nh2/haskell-netpbm — pull request #1 by lehins (2014-02-03 12:51:52+00:00)
Title: fixed vector import issues for deriving Unbox.

Not sure if it was vector package or vector-th-unbox, but something broke derivingUnbox. Here is the fix for it.
PS. Are you planning on adding PBM image types write functionality?