Index: celt/arm/armcpu.c
--- celt/arm/armcpu.c.orig
+++ celt/arm/armcpu.c
@@ -191,7 +191,7 @@ static opus_uint32 opus_cpu_capabilities(void)
   return flags;
 }
 
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__OpenBSD__)
 #include <sys/auxv.h>
 
 static opus_uint32 opus_cpu_capabilities(void)