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Edit 1: I am trying to build gdb from source.

Why can't I use autoconf 2.65 instead of 2.64? It is confusing:(

 /var/lib/gforge/chroot/home/users/mirror/ins/ins-autoconf/bin/autoreconf -iv
autoreconf: Entering directory `.'
autoreconf: not using Gettext
autoreconf: running: aclocal error: Please use exactly Autoconf 2.64 instead of 2.65.
config/override.m4:104: _GCC_AUTOCONF_VERSION_CHECK is expanded from... the top level
autom4te: /usr/bin/m4 failed with exit status: 1
aclocal: /var/lib/gforge/chroot/home/users/mirror/ins/ins-autoconf/bin/autom4te failed with exit status: 1
autoreconf: aclocal failed with exit status: 1
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up vote 1 down vote accepted

Not specific to gdb, an explanation (along with possible solutions) is here.

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