Issue #5668 has been updated by Motohiro KOSAKI. Status changed from Open to Rejected Backport93 project only accept backport request. You should fix trunk at first. ---------------------------------------- Backport #5668: autoconf failure on HP-UX/PA 11.11 https://bugs.ruby-lang.org/issues/5668 Author: hongbo hu Status: Rejected Priority: Normal Assignee: Category: Target version: $ ./configure On HP-UX/PA: checking whether _SC_CLK_TCK is supported... yes checking stack growing direction on hppa2.0w... ./configure[14718]: ${rb_cv_stack_grow_dir_hppa2.0w+:}: The specified substitution is not valid for this command. seems Backport #5488 but I apply the patch provide by Backport #5488, it did't work -- http://redmine.ruby-lang.org