--- flang/runtime/exceptions.cpp.orig
+++ flang/runtime/exceptions.cpp
@@ -44,7 +44,7 @@
   Terminator terminator{__FILE__, __LINE__};
 
   static constexpr uint32_t v{FE_INVALID};
-#if __x86_64__
+#if __x86_64__ && !defined(__FreeBSD__)
   static constexpr uint32_t s{__FE_DENORM}; // nonstandard, not a #define
 #else
   static constexpr uint32_t s{0};