From 4c54012373e6546704f534d0de3e900704ae9d11 Mon Sep 17 00:00:00 2001
From: Jim Mussared <jim.mussared@gmail.com>
Date: Mon, 15 Feb 2021 15:49:20 +1100
Subject: [PATCH] unix/moduselect: Don't allow both posix and non-posix
 configurations.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
---
 ports/unix/moduselect.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ports/unix/moduselect.c b/ports/unix/moduselect.c
index 6a0ee79aa6..a9390a146b 100644
--- a/ports/unix/moduselect.c
+++ b/ports/unix/moduselect.c
@@ -29,6 +29,10 @@
 
 #if MICROPY_PY_USELECT_POSIX
 
+#if MICROPY_PY_USELECT
+#error "Can't have both MICROPY_PY_USELECT and MICROPY_PY_USELECT_POSIX."
+#endif
+
 #include <stdio.h>
 #include <errno.h>
 #include <poll.h>