Building OpenCV on Raspberry Pi fails

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Hi,

i used this tutorial for installing OpenCv with Contrib modules on my Raspberry Pi 3 model 2: http://www.life2coding.com/install-op...

but it fails at 65%. I use Ubuntu Mate 16.02. Does anybody have an idea why it crashes or what i should install in order for it to compile? I additionally tried to install:

sudo apt-get install libwebp-dev

but that didn't change anything...

Thanks, MarviB

[  0%] Built target gen-pkgconfig
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[ 65%] Linking CXX executable ../../bin/opencv_traincascade
../../lib/libopencv_imgcodecs.so.3.4.0: undefined reference to `WebPEncodingSetError'
../../lib/libopencv_imgcodecs.so.3.4.0: undefined reference to `WebPEncode'
collect2: error: ld returned 1 exit status
apps/traincascade/CMakeFiles/opencv_traincascade.dir/build.make:389: recipe for target 'bin/opencv_traincascade' failed
make[2]: *** [bin/opencv_traincascade] Error 1
CMakeFiles/Makefile2:3866: recipe for target 'apps/traincascade/CMakeFiles/opencv_traincascade.dir/all' failed
make[1]: *** [apps/traincascade/CMakeFiles/opencv_traincascade.dir/all] Error 2
Makefile:160: recipe for target 'all' failed
make: *** [all] Error 2