Add more hints for debugging make rules.

Committing the doc update below to maint, for master and branch-1.11. Also, I'm adding you to THANKS, Ludo and Andy, hoping that you'll be providing more help in the near future anyway. ;-) Thanks, Ralf Add more hints for debugging make rules. * doc/automake.texi (Debugging Make

Re: Document current policy for development with git.

At Thursday 29 July 2010, Ralf Wildenhues wrote: Hi Stefano, Eric, thanks for the review! Hello Ralf. Sorry for the late answer, I missed your message somehow. I like the wording. However, I'd also like to see a simple example, such as the one you provided me with in a previous mail