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+/* Header with interface version macros for library pieces copied elsewhere.
+Copyright (C) 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#ifndef _GNU_VERSIONS_H
+#define	_GNU_VERSIONS_H	1
+
+/* This file exists to define these few macros.  Each specifies a version
+   number associated with the library interface of a piece of the C library
+   which is also distributed with other GNU packages.  These pieces are
+   both part of the GNU C library and also distributed with other GNU
+   packages so those packages may use their facilities on systems lacking
+   the GNU C library.  The source files for each piece surround all their
+   code with `#ifndef ELIDE_CODE' after defining it with this:
+
+   #define OBSTACK_INTERFACE_VERSION 1
+   #if !defined (_LIBC) && defined (__GNU_LIBRARY__) && __GNU_LIBRARY__ > 1
+   #include <gnu-versions.h>
+   #if _GNU_OBSTACK_INTERFACE_VERSION == OBSTACK_INTERFACE_VERSION
+   #define ELIDE_CODE
+   #endif
+   #endif
+
+   This allows those one to avoid compiling those files when part of a GNU
+   package not libc, on a system using a GNU C library that supports the
+   same interface.
+
+   Please preserve the format of the comments after each macro.  And
+   remember, if any of these versions change, the libc.so major version
+   number must change too (so avoid it)!  */
+
+#define _GNU_OBSTACK_INTERFACE_VERSION	1 /* vs malloc/obstack.c */
+#define _GNU_REGEX_INTERFACE_VERSION	1 /* vs posix/regex.c */
+
+#endif	/* gnu-versions.h */