#serial 5 dnl Copyright (C) 2002, 2005, 2007 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_REQUIRE([gl_UNISTD_H_DEFAULTS]) AC_CHECK_FUNCS_ONCE([dup2]) if test $ac_cv_func_dup2 = no; then HAVE_DUP2=0 AC_LIBOBJ([dup2]) fi ])