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diff --git a/m4/backupfile.m4 b/m4/backupfile.m4
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+# backupfile.m4 serial 1
+dnl Copyright (C) 2002 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License. As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
+
+AC_DEFUN([gl_BACKUPFILE],
+[
+ dnl Prerequisites of lib/backupfile.c.
+ AC_REQUIRE([AC_HEADER_DIRENT])
+ AC_REQUIRE([AC_FUNC_CLOSEDIR_VOID])
+ AC_CHECK_HEADERS_ONCE(limits.h stdlib.h string.h)
+ AC_CHECK_DECLS_ONCE(getenv malloc)
+ jm_CHECK_TYPE_STRUCT_DIRENT_D_INO
+
+ dnl Prerequisites of lib/addext.c.
+ AC_REQUIRE([jm_AC_DOS])
+ AC_SYS_LONG_FILE_NAMES
+ AC_CHECK_HEADERS_ONCE(limits.h string.h unistd.h)
+ AC_CHECK_FUNCS(pathconf)
+])