diff --git a/devel/dmalloc/patches/400-undef-strndup.patch b/devel/dmalloc/patches/400-undef-strndup.patch
new file mode 100644
index 000000000..e7141edc4
--- /dev/null
+++ b/devel/dmalloc/patches/400-undef-strndup.patch
@@ -0,0 +1,10 @@
+--- dmalloc-5.5.2/dmalloc.h.3	2012-04-11 22:59:21.624323311 +0200
++++ dmalloc-5.5.2.mod/dmalloc.h.3	2012-04-11 23:00:53.612325497 +0200
+@@ -405,6 +405,7 @@
+  *
+  * string -> String we are duplicating.
+  */
++#undef strdup
+ extern
+ char	*strdup(const char *string);
+ #endif /* ifndef DMALLOC_STRDUP_MACRO */