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     (define-g-enum g-name name (&key (export t) type-initializer) &body value*)
     
     value ::= :keyword
     value ::= (:keyword integer)
     name
enum_get_type. 
Macro that defines CFFI enumeration, registers it with GValue, and calls the type initializer.
Example:
     (define-g-enum "GtkTextDirection" text-direction
       (:export t :type-initializer "gtk_text_direction_get_type")
       (:none 0) (:ltr 1) (:rtl 2))
     
     (define-g-enum "GtkSizeGroupMode" size-group-mode
      (:export t :type-initializer "gtk_size_group_mode_get_type")
      :none :horizontal :vertical :both)