I see that Texinfo's configure.ac requires autoconf 2.59 with an AC_PREREQ call, after AC_INIT and AM_INIT_AUTOMAKE has been invoked. But AM_INIT_AUTOMAKE requires Automake 1.12 or later, and that will cause autoconf 2.62 or later to be AC_PREREQ'd anyway, so that the explicit AC_PREREQ by Texinfo is redundant. IMHO, it should be either removed, or made consistent with what AM_INIT_AUTOMAKE([1.12]) requires.
Regards, Stefano
