1#serial 3 2dnl Copyright (C) 2002, 2005 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7AC_DEFUN([gl_FUNC_DUP2], 8[ 9 AC_REPLACE_FUNCS(dup2) 10 if test $ac_cv_func_dup2 = no; then 11 gl_PREREQ_DUP2 12 fi 13]) 14 15# Prerequisites of lib/dup2.c. 16AC_DEFUN([gl_PREREQ_DUP2], [ 17 AC_CHECK_HEADERS_ONCE(unistd.h) 18]) 19