diff --git a/cube/CMakeLists.txt b/cube/CMakeLists.txt
index ac39830f2..451303f94 100644
--- a/cube/CMakeLists.txt
+++ b/cube/CMakeLists.txt
@@ -174,6 +174,10 @@ elseif(NOT WIN32)
                        cube.vert.inc
                        cube.frag.inc)
         target_link_libraries(vkcube Vulkan::Vulkan)
+        CHECK_LIBRARY_EXISTS("rt" clock_gettime "" NEED_RT)
+        if (NEED_RT)
+            target_link_libraries(vkcube rt)
+        endif()
     endif()
 else()
     if(CMAKE_CL_64)