Index: rts/lib/xsimd/config/xsimd_align.hpp
--- rts/lib/xsimd/config/xsimd_align.hpp.orig
+++ rts/lib/xsimd/config/xsimd_align.hpp
@@ -35,7 +35,7 @@
  ********************/
 
 #ifndef XSIMD_ALLOCA
-    #if defined(__linux__)
+    #if defined(__linux__) || defined(__OpenBSD__)
         #define XSIMD_ALLOCA alloca
     #elif defined(_MSC_VER)
         #define XSIMD_ALLOCA _alloca
