Index: Modules/_ctypes/malloc_closure.c
===================================================================
--- Modules/_ctypes/malloc_closure.c	(revision 65680)
+++ Modules/_ctypes/malloc_closure.c	(working copy)
@@ -68,12 +68,28 @@
 	if (item == NULL)
 		return;
 #else
+#ifdef MAP_ANONYMOUS
 	item = (ITEM *)mmap(NULL,
 			    count * sizeof(ITEM),
 			    PROT_READ | PROT_WRITE | PROT_EXEC,
 			    MAP_PRIVATE | MAP_ANONYMOUS,
 			    -1,
 			    0);
+#else
+	{
+		/* SVR4 method to map anonymous memory is to open /dev/zero */
+		int fd = open("/dev/zero", O_RDWR);
+		if (fd == -1)
+			return;
+		item = (ITEM *)mmap(NULL,
+				    count * sizeof(ITEM),
+				    PROT_READ | PROT_WRITE | PROT_EXEC,
+				    MAP_PRIVATE,
+				    fd,
+				    0);
+		close(fd);
+	}
+#endif
 	if (item == (void *)MAP_FAILED)
 		return;
 #endif