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diff --git a/c/src/exec/sapi/include/rtems/extension.h b/c/src/exec/sapi/include/rtems/extension.h
new file mode 100644
index 0000000000..c9559855ef
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+++ b/c/src/exec/sapi/include/rtems/extension.h
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+/*  extension.h
+ *
+ *  This include file contains all the constants, structures, and
+ *  prototypes associated with the User Extension Manager.  This manager
+ *  provides a mechanism for manipulating sets of user-defined extensions.
+ *
+ *  Directives provided are:
+ *
+ *     + create user extension set
+ *     + get ID of user extension set
+ *     + delete user extension set
+ *
+ *  COPYRIGHT (c) 1989-1997.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may in
+ *  the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#ifndef __RTEMS_EXTENSION_MANAGER_h
+#define __RTEMS_EXTENSION_MANAGER_h
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rtems/score/object.h>
+#include <rtems/score/userext.h>
+#include <rtems/rtems/status.h>  /* XXX */
+#include <rtems/rtems/types.h>  /* XXX */
+
+/*
+ *  Extension related types
+ */
+
+typedef User_extensions_routine                   rtems_extension;
+typedef User_extensions_thread_create_extension   rtems_task_create_extension;
+typedef User_extensions_thread_delete_extension   rtems_task_delete_extension;
+typedef User_extensions_thread_start_extension    rtems_task_start_extension;
+typedef User_extensions_thread_restart_extension  rtems_task_restart_extension;
+typedef User_extensions_thread_switch_extension   rtems_task_switch_extension;
+typedef User_extensions_thread_begin_extension    rtems_task_begin_extension;
+typedef User_extensions_thread_exitted_extension  rtems_task_exitted_extension;
+typedef User_extensions_fatal_extension           rtems_fatal_extension;
+
+typedef User_extensions_Table                     rtems_extensions_table;
+
+/*
+ *  The following defines the information control block used to manage
+ *  this class of objects.
+ */
+
+SAPI_EXTERN Objects_Information  _Extension_Information;
+
+/*
+ *  The following records define the control block used to manage
+ *  each extension.
+ */
+
+typedef struct {
+  Objects_Control          Object;
+  User_extensions_Control  Extension;
+}   Extension_Control;
+
+/*
+ *  _Extension_Manager_initialization
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine performs the initialization necessary for this manager.
+ */
+
+void _Extension_Manager_initialization(
+  unsigned32 maximum_extensions
+);
+
+/*
+ *  rtems_extension_create
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine implements the rtems_extension_create directive.  The
+ *  extension will have the name name.   The entry points of the
+ *  routines which constitute this extension set are in EXTENSION_TABLE.
+ *  It returns the id of the created extension in ID.
+ */
+
+rtems_status_code rtems_extension_create(
+  rtems_name              name,
+  rtems_extensions_table *extension_table,
+  Objects_Id              *id
+);
+
+/*
+ *  rtems_extension_ident
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine implements the rtems_extension_ident directive.
+ *  This directive returns the extension ID associated with name.
+ *  If more than one extension is named name, then the extension
+ *  to which the ID belongs is arbitrary.
+ */
+
+rtems_status_code rtems_extension_ident(
+  rtems_name    name,
+  Objects_Id   *id
+);
+
+/*
+ *  rtems_extension_delete
+ *
+ *  DESCRIPTION:
+ *
+ *  This routine implements the rtems_extension_delete directive.  The
+ *  extension indicated by ID is deleted.
+ */
+
+rtems_status_code rtems_extension_delete(
+  Objects_Id id
+);
+
+#ifndef __RTEMS_APPLICATION__
+#include <rtems/extension.inl>
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+/* end of include file */