From 0f5ea700462542c445b1a257b477abdc1d96e4ee Mon Sep 17 00:00:00 2001
From: Calvin Buckley <calvin@cmpct.info>
Date: Fri, 25 Jan 2019 08:04:16 -0500
Subject: MSG_DONTWAIT may not be present on all systems

---
 erts/emulator/sys/unix/erl_child_setup.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/erts/emulator/sys/unix/erl_child_setup.c b/erts/emulator/sys/unix/erl_child_setup.c
index 129861ebd5..f3662f94c6 100644
--- a/erts/emulator/sys/unix/erl_child_setup.c
+++ b/erts/emulator/sys/unix/erl_child_setup.c
@@ -491,7 +491,12 @@ main(int argc, char *argv[])
             ErtsSysForkerProto proto;
             errno = 0;
             if ((res = sys_uds_read(uds_fd, (char*)&proto, sizeof(proto),
+#if defined(MSG_DONTWAIT)
                                     pipes, 3, MSG_DONTWAIT)) < 0) {
+#else
+		/* XXX: a workaround here? */
+                                    pipes, 3, 0)) < 0) {
+#endif
                 if (errno == EINTR)
                     continue;
                 DEBUG_PRINT("erl_child_setup failed to read from uds: %d, %d", res, errno);
-- 
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