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diff --git a/gi/pygi-closure.h b/gi/pygi-closure.h
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+/* -*- Mode: C; c-basic-offset: 4 -*-
+ * vim: tabstop=4 shiftwidth=4 expandtab
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
+ * USA
+ */
+
+#ifndef __PYGI_CLOSURE_H__
+#define __PYGI_CLOSURE_H__
+
+#include <Python.h>
+#include <girffi.h>
+#include <ffi.h>
+
+G_BEGIN_DECLS
+
+
+/* Private */
+
+typedef struct _PyGICClosure
+{
+    GICallableInfo *info;
+    PyObject *function;
+
+    ffi_closure *closure;
+    ffi_cif cif;
+
+    GIScopeType scope;
+
+    PyObject* user_data;
+} PyGICClosure;
+
+void _pygi_closure_handle (ffi_cif *cif, void *result, void
+                           **args, void *userdata);
+
+void _pygi_invoke_closure_free (gpointer user_data);
+
+PyGICClosure* _pygi_make_native_closure (GICallableInfo* info,
+                                         GIScopeType scope,
+                                         PyObject *function,
+                                         gpointer user_data);
+
+G_END_DECLS
+
+#endif /* __PYGI_CLOSURE_H__ */