[tlbuild] How to properly regenerate configure files?

[Mojca Miklavec]

On 15 July 2016 at 00:48, Karl Berry wrote:
>        https://github.com/gregorio-project/gregorio/pull/1186
>     Can someone please help me to get a modified configure file?
>
> Committed.  Hope it works out.  -k

Thank you. I "stole" your configure script, prepared a patch for
MacPorts and the compilation now succeeds.

Mojca

(Just curious: why do the two configure.ac files,
gregorio/configure.ac and gregorio/gregorio-src/configure.ac differ so
much?)