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/usr/lib/x86_64-linux-gnu/perl5/5.24/Gtk2/Install/doctypes is in libgtk2-perl 2:1.2499-1.

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# Use this file to add to the documentation generation system a set of
# C type name to Perl type description mappings for types which are not
# registered with the GLib type system.  This allows the documentation
# system to produce useful type names or descriptions in documentation.
# The C type name should have no spaces; namely, do NOT include
# "const" and/or "*".  Also, "_ornull" is handled for you ("or undef" gets
# appended to the description).  The description may have spaces.
#
# C name        description
# ------------  ----------------
GtkTargetEntry  Gtk2::TargetEntry
GtkTargetList   Gtk2::TargetList
GdkAtom         Gtk2::Gdk::Atom
GdkBitmap       Gtk2::Gdk::Bitmap
GdkNativeWindow Gtk2::Gdk::NativeWindow
GdkGeometry     Gtk2::Gdk::Geometry
GdkKeymap_orclass	Gtk2::Gdk::Keymap
GdkPixbuf_noinc		Gtk2::Gdk::Pixbuf
GdkPixbufFormat		hash reference