Not every platform has malloc.h. Apply a patch from the Quagga CVS.

net/quagga-devel/distinfo

@@ -1,6 +1,7 @@
-$NetBSD: distinfo,v 1.3 2006/06/05 13:58:54 gdt Exp $
+$NetBSD: distinfo,v 1.4 2006/12/02 05:06:33 minskim Exp $
 
 SHA1 (quagga-0.99.4.tar.gz) = eb5c12c6345e7651114c704dd3c945d0c7595c10
 RMD160 (quagga-0.99.4.tar.gz) = a0818323c7dc714ed9514cf3cb8110a891b2fa5d
 Size (quagga-0.99.4.tar.gz) = 2207774 bytes
 SHA1 (patch-aa) = 1f79ffb63837c2e93204906c7ec96373154ced2e
+SHA1 (patch-ab) = e6b98d9f0ebbf8ce7ddc1ac6fc70a6da0a5a0234

net/quagga-devel/patches/patch-ab

@@ -0,0 +1,15 @@
+$NetBSD: patch-ab,v 1.1 2006/12/02 05:06:33 minskim Exp $
+
+--- lib/memory.c.orig	2006-03-30 05:47:38.000000000 -0800
++++ lib/memory.c
+@@ -21,7 +21,10 @@
+  */
+ 
+ #include <zebra.h>
++/* malloc.h is generally obsolete, however GNU Libc mallinfo wants it. */
++#if !defined(HAVE_STDLIB_H) || (defined(GNU_LINUX) && defined(HAVE_MALLINFO))
+ #include <malloc.h>
++#endif /* !HAVE_STDLIB_H || HAVE_MALLINFO */
+ 
+ #include "log.h"
+ #include "memory.h"