# glibc21.m4 serial 3dnl Copyright (C) 2000-2002, 2004 Free Software Foundation, Inc.dnl This file is free software; the Free Software Foundationdnl 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"  ])