From 7816a9777bb670dbd1f61cf1421757d5102ce362 Mon Sep 17 00:00:00 2001
From: Brian Kuhl <brian.kuhl@windriver.com>
Date: Wed, 6 Sep 2017 20:59:35 -0400
Subject: [PATCH] Update alloc_lib.c

---
 src/alloc_lib.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/alloc_lib.c b/src/alloc_lib.c
index 3b24be4..077768b 100644
--- a/src/alloc_lib.c
+++ b/src/alloc_lib.c
@@ -15,6 +15,11 @@
    #error "DLMALLOC_VERSION undefined"
 #endif
 
+#ifdef __VXWORKS__
+// no sbrk() in VxWorks, configure dlmalloc to use only mmap() 
+#define HAVE_MORECORE 0
+#endif 
+
 #if DLMALLOC_VERSION == 286
    #include "dlmalloc_ext_2_8_6.c"
 #else