I have the following versions of mkisofs/cdrecord available for download:
Of course, you can also retrieve the original cdrecord version 1.6 from the server in Germany.
My modified version of cdrecord uses standard Gnu autoconf so that it should be much, much more portable. I've eliminated it's dependency on a "proprietary" version of printf(), and I've removed the unnecessarily complicated and non-portable Makefiles.
Here are some usage notes for cdrecord on AIX.
I also have older, hacked 1.5 source code and installp format module, though you probably don't want these.
Do not use the stock version of cdrecord from Jörg Schilling's ftp site, even though it claims to support AIX. It does not. It WILL unceremoniously panic your kernel, and the README file included with it is wrong.
If you don't already have Gnu's gzip, you'll need to fetch either the self-extracting precompiled or source code version of that utility and install it first in order to decompress these files.
Here are some sports-related links for Michael Holsberger.
And here are some construction-related links for Matthew Holsberger.