Index: adm/cmake/occt_toolkit.cmake
--- adm/cmake/occt_toolkit.cmake.orig
+++ adm/cmake/occt_toolkit.cmake
@@ -450,6 +450,11 @@ if (APPLE)
   endif()
 endif()
 
+if (CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
+  find_package (Backtrace REQUIRED)
+  target_link_libraries (${PROJECT_NAME} ${Backtrace_LIBRARIES})
+endif()
+
 # Update list of used VTK libraries if OpenGL2 Rendering BackEnd is used.
 # Add VTK_OPENGL2_BACKEND definition.
 if("${VTK_RENDERING_BACKEND}" STREQUAL "OpenGL2" OR IS_VTK_9XX)
