From eb5a41eeb55002e23b8360206b82cab617369352 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@warmcat.com>
Date: Mon, 13 Apr 2020 19:28:33 +0100
Subject: [PATCH] eventfd: restrict test to linux

Seems otherwise it gets confused on iOS
---
 CMakeLists.txt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7592ac8b4..a20737d64 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -904,7 +904,10 @@ CHECK_FUNCTION_EXISTS(atoll LWS_HAVE_ATOLL)
 CHECK_FUNCTION_EXISTS(_atoi64 LWS_HAVE__ATOI64)
 CHECK_FUNCTION_EXISTS(_stat32i64 LWS_HAVE__STAT32I64)
 CHECK_FUNCTION_EXISTS(clock_gettime LWS_HAVE_CLOCK_GETTIME)
-CHECK_FUNCTION_EXISTS(eventfd LWS_HAVE_EVENTFD)
+
+IF (CMAKE_SYSTEM_NAME STREQUAL Linux)
+	CHECK_FUNCTION_EXISTS(eventfd LWS_HAVE_EVENTFD)
+endif()
 
 if (NOT LWS_HAVE_GETIFADDRS)
 	if (LWS_WITHOUT_BUILTIN_GETIFADDRS)