diff --git a/CMakeLists.txt b/CMakeLists.txt
index cb13adf81..1c5d89792 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -61,11 +61,6 @@ IF(CMAKE_SYSTEM MATCHES IRIX)
     SET(CMAKE_THREAD_LIBS_INIT "" CACHE INTERNAL "")    
 ENDIF(CMAKE_SYSTEM MATCHES IRIX)
 
-IF(SunOS)
-    # SunOS requires -lrt to link otherwise undefined sybmol sched_yield is reported.
-    SET(CMAKE_THREAD_LIBS_INIT ${CMAKE_THREAD_LIBS_INIT} " " -lrt)
-ENDIF(SunOS)
-
 # Find OpenGL
 FIND_PACKAGE(OpenGL)