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  There are two macros which serve as bulk disablers of advanced
  features of this malloc: NO_FANCY_MALLOC, PLAIN_MALLOC (undef by
...
  their exact effect.  Defining NO_FANCY_MALLOC returns malloc.c to th
+e
  state of the malloc in Perl 5.004.  Additionally defining PLAIN_MALL
+OC
  returns it to the state as of Perl 5.000.

./Configure -DDEBUGGING -Dprefix=/usr/local/debugperl \
-DNO_FANCY_MALLOC -DPLAIN_MALLOC -es