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devel/gtk2hs-buildtools: import gtk2hs-buildtools-0.13.11.0

This package provides a set of helper programs necessary to build the Gtk2Hs
suite of libraries. These tools include a modified c2hs binding tool that is
used to generate FFI declarations, a tool to build a type hierarchy that
mirrors the C type hierarchy of GObjects found in glib, and a generator for
signal declarations that are used to call back from C to Haskell. These
tools are not needed to actually run Gtk2Hs programs.