Index: src/Tests/CMakeLists.txt
--- src/Tests/CMakeLists.txt.orig
+++ src/Tests/CMakeLists.txt
@@ -61,7 +61,11 @@ if(NOT (${CMAKE_SYSTEM_NAME} STREQUAL "Windows"))
                            ${PLATFORM_LIBRARIES})
 
     add_executable(ins-test InstrumentStats.cpp)
-    target_link_libraries(ins-test ${test_lib} rt)
+    if(HAVE_LIBRT)
+        target_link_libraries(ins-test ${test_lib} rt)
+    else()
+        target_link_libraries(ins-test ${test_lib})
+    endif()
 
     if(LIBLO_FOUND)
         cp_script(check-ports.rb)
