#serial 3 dnl Copyright (C) 2002, 2005 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. AC_DEFUN([gl_FUNC_DUP2], [ AC_REPLACE_FUNCS(dup2) if test $ac_cv_func_dup2 = no; then gl_PREREQ_DUP2 fi ]) # Prerequisites of lib/dup2.c. AC_DEFUN([gl_PREREQ_DUP2], [ AC_CHECK_HEADERS_ONCE(unistd.h) ])