+if test "$after_morecore_hook_exists" = "yes" ; then
+ AC_DEFINE([HAVE_MORECORE_HOOK], [1], [Define if __after_morecore_hook is available])
+fi
+AC_SUBST(HAVE_MORECORE_HOOK)
+free_hook_exists=yes
+AC_MSG_CHECKING(whether __free_hook exists)
+AC_LINK_IFELSE([AC_LANG_SOURCE([
+ [extern void (* __free_hook)();]
+ [main() {__free_hook = 0;}]
+ ])],
+ [AC_MSG_RESULT(yes)],
+ [AC_MSG_RESULT(no)
+ free_hook_exists=no])
+if test "$free_hook_exists" = "yes" ; then
+ AC_DEFINE([HAVE_FREE_HOOK], [1], [Define if __free_hook is available])
+fi
+AC_SUBST(HAVE_FREE_HOOK)