I noticed that gnulib/m4/memcmp.m4 was removed after this update:

Author: Pedro Alves <pedro@codesourcery.com>
Date:   Sun May 23 00:56:58 2010 +0000

    gdb/
    2010-05-23  Pedro Alves  <pedro@codesourcery.com>

        Update gnulib from latest git.
        (250b80067c1e1d8faa0c42fb572f721975b929c5)
[...]
        * gnulib/m4/memcmp.m4: Removed.

We should remove gnulib/m4/memcmp.m4 from aclocal_m4_deps as well.  It
is somewhat obvious, but review is welcome.

-- 
Yao (齐尧)