This patch is from upstream and shouldn't be needed in the next release.
https://github.com/ericwa/ericw-tools/commit/982ef5276bb231ded12c45a686b0875594175774.patch

From 982ef5276bb231ded12c45a686b0875594175774 Mon Sep 17 00:00:00 2001
From: Bryan Haley <bryanmhaley@gmail.com>
Date: Mon, 28 Mar 2022 22:05:28 -0700
Subject: [PATCH] Add check for SSE2 in light.cc (#328)

---
 light/light.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/light/light.cc b/light/light.cc
index 7e23d040f..c00844643 100644
--- a/light/light.cc
+++ b/light/light.cc
@@ -33,7 +33,7 @@
 #include <common/polylib.hh>
 #include <common/bsputils.hh>
 
-#ifdef HAVE_EMBREE
+#if defined(HAVE_EMBREE) && defined (__SSE2__)
 #include <xmmintrin.h>
 //#include <pmmintrin.h>
 #endif
@@ -255,7 +255,7 @@ LightThread(void *arg)
 {
     const mbsp_t *bsp = (const mbsp_t *)arg;
 
-#ifdef HAVE_EMBREE
+#if defined(HAVE_EMBREE) && defined (__SSE2__)
     _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
 //    _MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_ON);
 #endif
