diff --git a/CMakeLists.txt b/CMakeLists.txt
index af22903..01ddba7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -581,9 +581,13 @@ if(WIN32 AND NOT CYGWIN)
 endif()
 
 if(NOT MSVC)
-  set(CMAKE_REQUIRED_LIBRARIES rt)
+  if(NOT APPLE)
+    set(CMAKE_REQUIRED_LIBRARIES rt)
+  endif()
   check_cxx_symbol_exists(clock_gettime time.h HAVE_CLOCK_GETTIME)
-  set(CMAKE_REQUIRED_LIBRARIES)
+  if(NOT APPLE)
+    set(CMAKE_REQUIRED_LIBRARIES)
+  endif()
 
   check_cxx_symbol_exists(fork unistd.h HAVE_FORK)
   check_cxx_symbol_exists(gethrtime sys/time.h HAVE_GETHRTIME)