Index: testing/cffi0/test_verify.py
--- testing/cffi0/test_verify.py.orig
+++ testing/cffi0/test_verify.py
@@ -1836,7 +1836,7 @@ def test_callback_indirection():
         #include <malloc.h>
         #define alloca _alloca
         #else
-        # ifdef __FreeBSD__
+        # if defined(__FreeBSD__) || defined(__OpenBSD__)
         #  include <stdlib.h>
         # else
         #  include <alloca.h>
