MediaSamples_Linux_6.0 generated failed

[然_魏_]

Hi, I tried to generated MediaSamples with MediaServerStudioEssentials2015R6. following
\MediaSamples_Linux_6.0.16043175.175\Media_Samples_Guide.pdf

Error details：

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[ samples]# perl build.pl --cmake=intel64,make,debug --build --clean

...............

cd /home/MediaSDK_R6/MediaSamples_Linux_6.0.16043175.175/samples/__cmake/intel64.make.debug/sample_plugins/rotate_opencl && /bin/c++   -DLINUX -DLINUX32 -DLINUX64 -DMFX_FILE_VERSION=\"0.15.11.30\" -DMFX_PRODUCT_VERSION=\"0.0.000.0000\" -DUNIX -D_FILE_OFFSET_BITS=64 -D__USE_LARGEFILE64 -Dsample_plugin_opencl_EXPORTS -m64 -msse4.2 -pipe -fPIC -O0 -Wall -Wno-unknown-pragmas -Wno-unused -g -D_DEBUG -fPIC -I/opt/intel/mediasdk/include -I/home/MediaSDK_R6/MediaSamples_Linux_6.0.16043175.175/samples/sample_common/include -I/home/MediaSDK_R6/MediaSamples_Linux_6.0.16043175.175/samples/sample_plugins/rotate_opencl/include    -DCL_USE_DEPRECATED_OPENCL_1_1_APIS  -I/usr/include  -DLIBVA_SUPPORT  -o CMakeFiles/sample_plugin_opencl.dir/src/opencl_filter_va.cpp.o -c /home/MediaSDK_R6/MediaSamples_Linux_6.0.16043175.175/samples/sample_plugins/rotate_opencl/src/opencl_filter_va.cpp
In file included from /home/MediaSDK_R6/MediaSamples_Linux_6.0.16043175.175/samples/sample_plugins/rotate_opencl/src/opencl_filter_va.cpp:13:0:
/home/MediaSDK_R6/MediaSamples_Linux_6.0.16043175.175/samples/sample_plugins/rotate_opencl/include/opencl_filter_va.h:25:23: fatal error: CL/va_ext.h: No such file or directory
 #include <CL/va_ext.h>
                       ^
compilation terminated.
gmake[2]: *** [sample_plugins/rotate_opencl/CMakeFiles/sample_plugin_opencl.dir/src/opencl_filter_va.cpp.o] Error 1
gmake[2]: Leaving directory `/home/MediaSDK_R6/MediaSamples_Linux_6.0.16043175.175/samples/__cmake/intel64.make.debug'
gmake[1]: *** [sample_plugins/rotate_opencl/CMakeFiles/sample_plugin_opencl.dir/all] Error 2
gmake[1]: Leaving directory `/home/MediaSDK_R6/MediaSamples_Linux_6.0.16043175.175/samples/__cmake/intel64.make.debug'
gmake: *** [all] Error 2

[ intel64.make.debug                                 State: FAIL ]

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However， I had installed OpenCL successfully:

[samples]# find / -name libOpenCL.so*
/opt/intel/opencl/libOpenCL.so.1
/opt/intel/opencl/libOpenCL.so
/opt/intel/opencl/libOpenCL.so.1.2
[samples]#

[ samples]# find / -name va_ext.h
/opt/intel/mediasdk/MediaSamples_Linux_5.0.1604371.71/samples/opencl_motionestimation/common/CL/va_ext.h
/opt/intel/mediasdk/MediaSamples_Linux_5.0.1604371.71/samples/opencl_motionestimation/MotionEstimation/CL/va_ext.h
/opt/intel/opencl/include/CL/va_ext.h
[ samples]#

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Have I done something wrong? Can anyone help me? Thanks~

Platform:
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      8  Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz
00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller

[8086:0412] (rev 06)
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