diff --git a/ftk/Makefile b/ftk/Makefile
index 2b6f8ac..5274754 100644
--- a/ftk/Makefile
+++ b/ftk/Makefile
@@ -837,7 +837,7 @@ ifdef unix_target
 			compiler = CC
 			exe_linker = CC
 			shared_linker = ld
-			compiler_version := $(shell $(compiler) -V)	
+			compiler_version := $(shell $(compiler) -V 2>&1)	
 			ifneq (,$(findstring Sun C++,$(compiler_version)))
 				sun_studio_compiler = yes
 			endif
diff --git a/ftk/src/ftksys.h b/ftk/src/ftksys.h
index efcee2c..9e1d525 100644
--- a/ftk/src/ftksys.h
+++ b/ftk/src/ftksys.h
@@ -145,6 +145,7 @@
 		#include <unistd.h>
 		#include <utime.h>
 		#include <aio.h>
+		#include <sched.h>
 		#include <arpa/inet.h>
 		#include <netinet/tcp.h>
 		#include <sys/mman.h>
diff --git a/ftk/src/ftkunix.cpp b/ftk/src/ftkunix.cpp
index e0c8d7a..e05ebc4 100644
--- a/ftk/src/ftkunix.cpp
+++ b/ftk/src/ftkunix.cpp
@@ -1735,6 +1735,7 @@ Desc:
 ****************************************************************************/
 void FLMAPI f_yieldCPU( void)
 {
+	sched_yield();
 }
 
 /**********************************************************************