diff -rup a/open.c b/open.c
--- a/open.c	2017-05-22 13:33:51.000000000 -0400
+++ b/open.c	2017-06-16 21:39:19.443745779 -0400
@@ -41,6 +41,10 @@
 #undef O_ACCMODE
 #define O_ACCMODE 03
 
+#ifndef O_TMPFILE
+#define O_TMPFILE 020000000
+#endif
+
 #ifdef O_LARGEFILE
 # if O_LARGEFILE == 0          /* biarch platforms in 64-bit mode */
 #  undef O_LARGEFILE