I'm curious why the xmalloc() function (and its brethren) exits with a
fatal error on only some systems and not on all systems?  I would think
that the code should use the exiting functions in all cases, and just
provide differing versions of xstrdup() so that the HAVE_MCHECK_H
version does a malloc() (rather than strdup() doing it).

If I'm not off track, you can apply the attached patch to implement
this.

..wayne..