Hello,
Thanks for the explanation about the licenses.

Attachment patch with suggested changes.

> I don't see this in the sources
> (https://svn.filezilla-project.org/filezilla/libfilezilla/tags/0.9.0/). 
> I'm
> pretty sure those GPLv3 licensed files are part of the GNU
> autotools rather than libfilezilla.
> 
>> libfilezilla-0.9.0/config/test-driver:# the Free Software Foundation;
>> either version 2, or (at your option)
>> libfilezilla-0.9.0/configure:# published by the Free Software
>> Foundation; either version 2 of
>> libfilezilla-0.9.0/COPYING:    the Free Software Foundation; either
>> version 2 of the License, or
>> libfilezilla-0.9.0/m4/ax_check_link_flag.m4:#   Free Software
>> Foundation, either version 3 of the License, or (at your
>> libfilezilla-0.9.0/m4/ax_check_compile_flag.m4:#   Free Software
>> Foundation, either version 3 of the License, or (at your
>> libfilezilla-0.9.0/m4/libtool.m4:# published by the Free Software
>> Foundation; either version 2 of
>> libfilezilla-0.9.0/m4/ax_append_flag.m4:#   Free Software Foundation,
>> either version 3 of the License, or (at your
> 
> m4 is part of autotools, which is GPLv3. It's not part of the
> libfilezilla project.
> 
>> libfilezilla-0.9.0/README:the Free Software Foundation; either version
>> 2 of the License, or