Issue #6204 has been reported by huhongbo (hongbo hu).

----------------------------------------
Bug #6204: autoconf failure on HP-UX/PA
https://bugs.ruby-lang.org/issues/6204

Author: huhongbo (hongbo hu)
Status: Open
Priority: Normal
Assignee: 
Category: build
Target version: 1.9.3
ruby -v: 1.9.3-p125


On HP-UX/PA:
#cd /tmp/ruby-1.9.3-p125
#./configure
checking build system type... hppa2.0w-hp-hpux11.11
checking host system type... hppa2.0w-hp-hpux11.11
checking target system type... hppa2.0w-hp-hpux11.11
.......
checking whether _SC_CLK_TCK is supported... yes
checking stack growing direction on hppa2.0w... ./configure[15505]: ${rb_cv_stack_grow_dir_hppa2.0w+:}: The specified substitution is not valid for this command.


-- 
http://bugs.ruby-lang.org/