Bug#785122: chocolate-doom is marked for autoremoval from testing

[Fabian Greffrath]

Dear Jonathan,

Am Mittwoch, den 20.05.2015, 04:39 +0000 schrieb Debian testing
autoremoval watch: 
> chocolate-doom 2.1.0-1 is marked for autoremoval from testing on 2015-06-10
> 
> It is affected by these RC bugs:
> 785122: chocolate-doom: includes licence-incompatible GPLv3 code

this is getting serious. I don't don't understand how GPL2-or-later and
GPL3-or-later could be incompatible with each other. Would you please
either elaborate on this issue or lower the severity of this bug?

Thank you,

- Fabian