(gl_BACKUPFILE): Don't check for stdlib.h, string.h, getenv, malloc.

diff --git a/m4/backupfile.m4 b/m4/backupfile.m4
index 1326bb2ab407ea39a6a578dce2a65d3aa249191e..f3c2aa5d5d28af1a9ea71c40af4316dd2bc1695d 100644 (file)
--- a/m4/backupfile.m4
+++ b/m4/backupfile.m4
@@ -1,4 +1,4 @@
-# backupfile.m4 serial 2
+# backupfile.m4 serial 3
 dnl Copyright (C) 2002, 2003 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
@@ -11,13 +11,11 @@ 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(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(string.h unistd.h)
+  AC_REQUIRE([AC_SYS_LONG_FILE_NAMES])
+  AC_CHECK_HEADERS_ONCE(unistd.h)
   AC_CHECK_FUNCS(pathconf)
 ])