--- src/CMakeLists.txt.orig	Fri Apr 12 21:51:14 2013
+++ src/CMakeLists.txt	Sun Apr 21 12:17:27 2013
@@ -101,12 +101,17 @@ target_link_libraries(rtl_adsb rtlsdr_shared
 if(UNIX)
 target_link_libraries(rtl_fm m)
 target_link_libraries(rtl_adsb m)
-if(APPLE)
-    target_link_libraries(rtl_test m)
-else()
-    target_link_libraries(rtl_test m rt)
-endif()
-endif()
+
+include(CheckFunctionExists)
+check_function_exists(clock_gettime LIBRT_LIBC_HAS_CLOCK_GETTIME)
+if(LIBRT_LIBC_HAS_CLOCK_GETTIME)
+    set(LIBRT_LIBRARIES)
+else(LIBRT_LIBC_HAS_CLOCK_GETTIME)
+    find_library(LIBRT_LIBRARIES NAMES rt )
+endif(LIBRT_LIBC_HAS_CLOCK_GETTIME)
+
+target_link_libraries(rtl_test m ${LIBRT_LIBRARIES})
+endif(UNIX)
 
 if(WIN32)
 target_link_libraries(rtl_sdr libgetopt_static)