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diff --git a/src/math/levene.h b/src/math/levene.h
index 67a4a115..c5e8bc3b 100644
--- a/src/math/levene.h
+++ b/src/math/levene.h
@@ -17,29 +17,15 @@
 #if !levene_h
 #define levene_h 1
 
-#include <data/casereader.h>
-#include <data/missing-values.h>
-#include <data/variable.h>
+struct casereader;
+struct variable;
 
-/* Calculate the Levene statistic
 
-The independent variable :   v_indep;
+enum mv_class;
 
-Number of dependent variables :   n_dep;
+double
+levene (struct casereader *rx, const struct variable *gvar,
+	const struct variable *var, const struct variable *wv,  enum mv_class exclude );
 
-The dependent variables :   v_dep;
 
-*/
-
-
-struct dictionary ;
-struct casefilter ;
-
-void  levene(const struct dictionary *dict, struct casereader *,
-	     const struct variable *v_indep, size_t n_dep,
-	     const struct variable **v_dep,
-	     enum mv_class exclude);
-
-
-
-#endif /* levene_h */
+#endif