Error time /usr/bin/ld: warning: libopencv_core.so.3.0
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/usr/bin/ld: warning: libopencv_core.so.3.0, needed by /usr/local/lib/libopencv_highgui.so, may conflict with libopencv_core.so.2.4
/usr/bin/ld: main.o: undefined reference to symbol '_ZN2cv6String10deallocateEv'
/usr/bin/ld: note: '_ZN2cv6String10deallocateEv' is defined in DSO /usr/local/lib/libopencv_core.so.3.0 so try adding it to the linker command line
/usr/local/lib/libopencv_core.so.3.0: could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status
make: *** [cons] Error 1
00:41:29: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project cons (kit: Desktop)
When executing step 'Make' -
Okay the answer is my case was:
https://help.ubuntu.com/community/OpenCV#Installation