# glibc21.m4 serial 3
  dnl Copyright (C) 2000-2002, 2004 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
  
  # Test for the GNU C Library, version 2.1 or newer.
  # From Bruno Haible.
  
  AC_DEFUN([gl_GLIBC21],
    [
      AC_CACHE_CHECK(whether we are using the GNU C Library 2.1 or newer,
        ac_cv_gnu_library_2_1,
        [AC_EGREP_CPP([Lucky GNU user],
  	[
  #include <features.h>
  #ifdef __GNU_LIBRARY__
   #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1) || (__GLIBC__ > 2)
    Lucky GNU user
   #endif
  #endif
  	],
  	ac_cv_gnu_library_2_1=yes,
  	ac_cv_gnu_library_2_1=no)
        ]
      )
      AC_SUBST(GLIBC21)
      GLIBC21="$ac_cv_gnu_library_2_1"
    ]
  )