Edit: glibc2.m4
# glibc2.m4 serial 3 dnl Copyright (C) 2000-2002, 2004, 2008, 2010-2016 Free Software Foundation, dnl 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 2.0 or newer. # From Bruno Haible. AC_DEFUN([gt_GLIBC2], [ AC_CACHE_CHECK([whether we are using the GNU C Library 2 or newer], [ac_cv_gnu_library_2], [AC_EGREP_CPP([Lucky GNU user], [ #include <features.h> #ifdef __GNU_LIBRARY__ #if (__GLIBC__ >= 2) && !defined __UCLIBC__ Lucky GNU user #endif #endif ], [ac_cv_gnu_library_2=yes], [ac_cv_gnu_library_2=no]) ] ) AC_SUBST([GLIBC2]) GLIBC2="$ac_cv_gnu_library_2" ] )
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