+(defmacro define-g-enum (g-name name (&key (export t) type-initializer) &body values)
+ "Defines a GEnum type for enumeration. Generates corresponding CFFI definition.
+
+Example:
+@begin{pre}
+\(define-g-enum \"GdkGrabStatus\" grab-status () :success :already-grabbed :invalid-time :not-viewable :frozen)
+\(define-g-enum \"GdkExtensionMode\" gdk-extension-mode (:export t :type-initializer \"gdk_extension_mode_get_type\")
+ (:none 0) (:all 1) (:cursor 2))
+@end{pre}
+@arg[g-name]{a string. Specifies the GEnum name}
+@arg[name]{a symbol. Names the enumeration type.}
+@arg[export]{a boolean. If true, @code{name} will be exported.}
+@arg[type-initializer]{a @code{NIL} or a string or a function designator.
+
+If non-@code{NIL}, specifies the function that initializes the type: string specifies a C function that returns the GType value and function designator specifies the Lisp function.}
+@arg[values]{values for enum. Each value is a keyword or a list @code{(keyword integer-value)}. @code{keyword} corresponds to Lisp value of enumeration, and @code{integer-value} is an C integer for enumeration item. If @code{integer-value} is not specified, it is generated automatically (see CFFI manual)}"