Issues in Apache upgrade while running make install on Aix

Over the long term, you are probably better off installing the Apache kit from the Apache web site, rather than the AIX kit.  Difficult though it may be, and though ./configure may whine, it's a better option.

Here's my reasoning.  Apache is designed to run in the environment of the standard build, and while it can be shuffled around into other directories, it means customizing both the build options and the run options.  If you stick with a build that is as much standard as possible, the chances of a problem are reduced.   The chances are good that the next time an Apache upgrade is done, it will be someone else doing it and they won't know what you do now.

Since Apache has ongoing security updates (and this is an issue with a version as old as 2.0, when current is 2.2 or 2.4), running an old version (a) exposes your site to known vulnerabilities, (b) prevents your site from working with new versions of Secure HTTP, and (c) makes it harder to maintain for both site management and web designers, who will demand the latest-and-greatest features.

In this situation I'd pass the above along to your management and tell them that you really need to get to at least version 2.2 (legacy), and preferably 2.4 which is the active line of development.  If you put it into terms of "There's ten years of vulnerabilities unfixed in 2.0" you should get the necessary support.