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diff --git a/src/data/casegrouper.h b/src/data/casegrouper.h
new file mode 100644
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--- /dev/null
+++ b/src/data/casegrouper.h
@@ -0,0 +1,48 @@
+/* PSPP - computes sample statistics.
+   Copyright (C) 2007 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA. */
+
+#ifndef DATA_CASEGROUPER_H
+#define DATA_CASEGROUPER_H 1
+
+#include <stdbool.h>
+#include <stddef.h>
+
+struct case_ordering;
+struct casereader;
+struct ccase;
+struct dictionary;
+struct variable;
+
+struct casegrouper *
+casegrouper_create_func (struct casereader *,
+                         bool (*same_group) (const struct ccase *,
+                                             const struct ccase *,
+                                             void *aux),
+                         void (*destroy) (void *aux),
+                         void *aux);
+struct casegrouper *casegrouper_create_vars (struct casereader *,
+                                             struct variable *const *vars,
+                                             size_t var_cnt);
+struct casegrouper *casegrouper_create_splits (struct casereader *,
+                                               const struct dictionary *);
+struct casegrouper *casegrouper_create_case_ordering (struct casereader *,
+                                                      const struct case_ordering *);
+bool casegrouper_get_next_group (struct casegrouper *, struct casereader **);
+bool casegrouper_destroy (struct casegrouper *);
+
+#endif /* data/casegrouper.h */