Thanks for the help!! Sory about the confusion on the regex, but it was to show that I've used several xlc aliases (c89_r, c99_r,cc_r, etc) and that I got the same results each time. I copied and pasted your example and got the following error:

List of earlier versions to include in @INC? [none]
<malloc/malloc.h> NOT found.
<malloc.h> NOT found.
Checking to see how big your pointers are...
cc: 1501-228 (W) input file undefined not found
(I can't seem to compile the test program.  Guessing...)
What is the size of a pointer (in bytes)? [4]

*** You have chosen a maximally 64-bit build,
*** but your pointers are only 4 bytes wide.
*** Please rerun Configure without -Duse64bitall.
*** Since you have quads, you could possibly try with -Duse64bitint.
*** Cannot continue, aborting.
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Where do I set the size of the pointers? Also, do I need to set a env var like SHLIB_PATH? So Configure can find the malloc.h? I set the env vars as follows:

$ export OBJECT_MODE=64
$ export CC=/usr/vac/bin/c99_r
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This is why I switched to using the '-Duse64bitint' flag. This is my first time I've ever used the xlc compiler and the docs from ibm seem to be incomplete. At a previous job, I compiled perl 5.12 and 5.14 with gcc on linux and only had to try it 2 to 3 times tops on the perl 5.12. I saved the env in make_opts.inc config file. Unfortunately, this an IBM shop and they won't let me have gcc, gawk, gtar, etc. I appreciate your help! Thanks!