Index: trunk/src/dnmalloc.c
===================================================================
--- trunk/src/dnmalloc.c	(revision 568)
+++ trunk/src/dnmalloc.c	(revision 569)
@@ -822,5 +822,5 @@
  * it may actually raise an error.
  */
-#if defined(HAVE_MALLOC_H) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__NetBSD__) && defined(__GLIBC__)
+#if defined(HAVE_MALLOC_H) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__NetBSD__) && defined(__GLIBC_PREREQ) && __GLIBC_PREREQ(2, 33)
 #include <malloc.h>
 #else