24. Distributing `Makefile.in's
Automake places no restrictions on the distribution of the resulting
`Makefile.in's. We still encourage software authors to distribute
their work under terms like those of the GPL, but doing so is not
required to use Automake.
Some of the files that can be automatically installed via the
--add-missing switch do fall under the GPL. However, these also
have a special exception allowing you to distribute them with your
package, regardless of the licensing you choose.