OpenBSD needs execinfo as well.

Author: 3405691582

Sources/Testing/CMakeLists.txt

@@ -124,7 +124,8 @@ if(NOT APPLE)
   endif()
   target_link_libraries(Testing PUBLIC
     Foundation)
-  if (CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+  if (CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" OR
+      CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
     target_link_libraries(Testing PUBLIC execinfo)
   endif()
 endif()