/* We are using the bottom of the stack to save some information, like the
* valgrind_stack_id. Define smx_context_usable_stack_size to give the remaining
* size for the stack. */
-#ifdef HAVE_VALGRIND_H
+#if HAVE_VALGRIND_H
# define smx_context_usable_stack_size \
(smx_context_stack_size - sizeof(unsigned int)) /* for valgrind_stack_id */
#else