message: Explicitly depend on librt on Linux
  Some compilation environment already does the right thing, but
  some other would fail to find clock_gettime(). This commit makes the
  dependency explicit.
diff: @@ -21,3 +21,14 @@ add_library(TestUtil ${TEST_UTIL_SOURCES})
  target_link_libraries(TestUtil Core)
  +if(UNIX AND NOT APPLE)
  + find_library(LIBRT rt)
  + if(LIBRT)
  + target_link_libraries(TestUtil ${LIBRT})
  + else()
  + message(WARNING "librt was not found. This means that the benchmarks will not be able to link properly.")
  + endif()
  +endif()
  +
  +
  +
  