In message <4a954aeb9bde1_212ee90f1247017 / redmine.ruby-lang.org>
	on Wed, 26 Aug 2009 23:47:10 +0900,
	Mamoru Tasaka <redmine / ruby-lang.org> wrote:
> Bug #2000: Change the license to "GPLv2+ or Ruby's original".
> http://redmine.ruby-lang.org/issues/show/2000
> 
> 起票者: Mamoru Tasaka
> ステータス: Open, 優先度: High
> ruby -v: 1.8.x/1.9.x
> 
> Hello.
> 
> Recently readline 6.0 was released and its license was changed from
> GPLv2+ (GPL version 2 and any later) to GPLv3+ [1][2]
> Unfortunately Ruby's license is still under GPLv2 and Ruby's original license [3],
> which is incompatible with GPLv3 [4]. So unless Ruby's license is changed
> to "GPLv2+ or Ruby's original license" or so , Ruby's readline module cannot be shipped
> any more. Note that "Ruby's original license" is regarded as incompatible with
> GPL [5].
> 
> So please change the Ruby's license to GPLv3 (and GPLv2) compat.
Another option is make Ruby use older readline library which was GPLv2
strictly.

And you need to know, Ruby's readline module work not only with GNU
readline but also editline library (contained in *BSD).  So, importing
editline library is another option.  :-)

-- 
Takahiro Kambe <taca / back-street.net>