Edit File: glibc21.m4
# glibc21.m4 serial 5 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 2.1 or newer, or uClibc. # From Bruno Haible. AC_DEFUN([gl_GLIBC21], [ AC_CACHE_CHECK([whether we are using the GNU C Library >= 2.1 or uClibc], [ac_cv_gnu_library_2_1], [AC_EGREP_CPP([Lucky], [ #include <features.h> #ifdef __GNU_LIBRARY__ #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1) || (__GLIBC__ > 2) Lucky GNU user #endif #endif #ifdef __UCLIBC__ Lucky user #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" ] )