It looks to me like you are simply not the target audience. The target audience is madmen who are so desperate to figure out where their programs are running out of memory that they are willing to look at malloc.c. This is clearly a last resort thing that no sane person would ever require, given the many other ways to debug a program.

Anyway, the docs do say that your Perl has to be built with -DPERL_EMERGENCY_SBRK and with Perl's malloc selected, so if you're AS build was not done that way, you can't expect it to work for you.