* configure.in: Invoke AM_LIB_DMALLOC.

* src/system.h: Use dmalloc.
* src/LR0.c: Be sure to have pointers initialized to NULL.
(allocate_itemsets): Allocate kernel_items only if needed.

aclocal.m4

@@ -937,6 +937,25 @@ if test $ac_cv_func_strerror_r = yes; then
 fi
 ])# AC_FUNC_STRERROR_R
 
+
+# serial 1
+
+AC_DEFUN([AM_WITH_DMALLOC],
+[AC_MSG_CHECKING([if malloc debugging is wanted])
+AC_ARG_WITH(dmalloc,
+[  --with-dmalloc          use dmalloc, as in
+                          http://www.dmalloc.com/dmalloc.tar.gz],
+[if test "$withval" = yes; then
+  AC_MSG_RESULT(yes)
+  AC_DEFINE(WITH_DMALLOC,1,
+            [Define if using the dmalloc debugging malloc package])
+  LIBS="$LIBS -ldmalloc"
+  LDFLAGS="$LDFLAGS -g"
+else
+  AC_MSG_RESULT(no)
+fi], [AC_MSG_RESULT(no)])
+])
+
 # Macro to add for using GNU gettext.
 # Ulrich Drepper <drepper@cygnus.com>, 1995.
 #