--- src/platform/generic/sysmem.c.orig	Tue Feb  3 14:42:48 2015
+++ src/platform/generic/sysmem.c	Tue Feb  3 14:43:21 2015
@@ -49,6 +49,11 @@ Returns available physical memory in bytes, with respe
 
 */
 
+/* XXX same as Darwin */
+#ifndef RLIMIT_AS
+#define RLIMIT_AS RLIMIT_RSS
+#endif
+
 /*
  * The POSIX name is _SC_PAGESIZE, but apparently some systems
  * require _SC_PAGE_SIZE instead.   (Specific citations would
