Can you try the development trunk as well? Since I guess you have no bzr, there is
a link to recently enough tarball: http://37.139.80.10/tmp/trunk-r117204.tgz.

First, try to compile as usual, i.e.

CFLAGS='-O0 -g3' ./configure --enable-checking

If that fails, try to use system malloc by applying an attached patch. This requires
you to regenerate build files with 'sh autogen.sh', which means that you will need
recently enough autoconf, automake and m4:

http://www.oss4aix.org/download/RPMS/autoconf/autoconf-2.69-1.aix5.1.ppc.rpm
http://www.oss4aix.org/download/RPMS/automake/automake-1.14.1-1.aix5.1.ppc.rpm
http://www.oss4aix.org/download/RPMS/m4/m4-1.4.17-1.aix5.1.ppc.rpm

(after installing, make sure /usr/bin/m4 is symlinked to /opt/freeware/bin/m4).

With system malloc, dumped executable will not work. But temacs should, and
you should be able to try it with MALLOCTYPE and MALLOCDEBUG.

Dmitry