How can I import build-aux/po/Makefile.in.in

[Akim Demaille]

Hi!

I would like bison to used gnulib's build-aux/po/Makefile.in.in,
but I don't understand how I am supposed to do that.  bison's
bootstrap is sync'ed with that of gnulib (the current master).

We do have "gettext" listed in our gnulib_modules (not
"gettext-h"), and autopoint is fired, as expected, but
gnulib-tool does not override these files.  The corresponding
node of the documentation is not clear about this.

http://www.gnu.org/software/gnulib/manual/gnulib.html#gettextize-and-autopoint

I have tried to get some inspiration from the coreutils,
but they don't use gnu lib's Makefile.in.in either.

So it is unclear to me how this file should be imported
(git grep Makefile.in.in finds nothing relevant).

Thanks in advance!