Issue #7173 has been updated by zzak (Zachary Scott).

Assignee changed from zzak (Zachary Scott) to nobu (Nobuyoshi Nakada)

I've made a patch in the following gist: https://gist.github.com/3899727

Assigning this to nobu, since it's not actual documentation.
----------------------------------------
Bug #7173: with-opt-dir flag documentation
https://bugs.ruby-lang.org/issues/7173#change-30892

Author: zzak (Zachary Scott)
Status: Open
Priority: Normal
Assignee: nobu (Nobuyoshi Nakada)
Category: DOC
Target version: 2.0.0
ruby -v: 2.0.0


From #7120:
Current documentation:
--with-opt-dir=DIR      add optional headers and libraries DIR

nobu's reply:
--with-opt-dir allows multiple paths separated by File::PATH_SEPARATOR




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