Updated patch attached.

2015-09-14 17:06 GMT-03:00 Vicente Vera <vicentemvp@gmail.com>:
> Hello,
>
> I'm not sure if it's correct, but I changed the license from gpl3+ to
> gpl2+ to keep it consistent with the r-markdown package
> (https://www.gnu.org/licenses/gpl-faq.html#v2v3Compatibility). Thanks
> for figuring that out.
>
> New patch attached.
>
> 2015-09-14 8:17 GMT-03:00 Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de>:
>> Hi Vicente,
>>
>>> From 36f94f07cba5edea4897ac36b92a73bfc6a3258b Mon Sep 17 00:00:00 2001
>>> From: Vicente Vera Parra <vicentemvp@gmail.com>
>>> Date: Sun, 13 Sep 2015 13:20:29 -0300
>>> Subject: [PATCH 11/19] gnu: Add r-knitr.
>>
>>> * gnu/packages/statistics.scm (r-knitr): New variable.
>>
>> [...]
>>
>>> +    (synopsis "General-Purpose Package for Dynamic Report Generation in R")
>>> +    (description
>>> +     "Provides a general-purpose tool for dynamic report generation in
>>> +R using Literate Programming techniques.")
>>
>> As before, please provide a better description (at least by replacing
>> “Provides” in the first sentence with “This package provides”); and use
>> lower-case in the synopsis.
>>
>>> +    (license license:gpl3+)))
>>
>> I don’t think this is correct.  The package actually doesn’t declare the
>> version of the GPL.  There are no license headers I could find and all
>> it says is
>>
>>     “This package is free and open source software, licensed under GPL.”
>>
>> Furthermore, as noted before, there might be a license conflict when
>> combining “r-knitr” with “r-markdown”, because the latter is released
>> under “GPLv2 only”.
>>
>> I just asked the author about what version of the GPL was intended
>> here[1].
>>
>> ~~ Ricardo
>>
>> [1]: https://github.com/yihui/knitr/issues/566#issuecomment-140042571