Users of any MP-version of TOUGH can take advantage of the bugfix made to Aztec.

In the Aztec2.1 source, look for the file az_sort.c (Aztec2.1/lib/az_sort.c).
Line 1433 readd:
      memcpy(ptr1, ptr2, thelength);
Change this to:
      memmove(ptr1, ptr2, thelength);

Alternatively, obtain a copy of TOUGH2.01-MP-CORE, and locate the following file:
tpls/aztec_extras/az_sort.c
Copy this file to the appropriate place in the Aztec sources and rebuild Aztec.