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OpenCV with gcc and CMake: Cannot find source file

Hello I installed OpenCV in Fedora 22 using this tutorial.

Now I'm following this example but CMake cannot find source file.

The CMakeLists.txt and DisplayImage.cpp are in the same directory.

[[email protected] OpenCV_tests]$ cmake .
        -- The C compiler identification is GNU 5.1.1
        -- The CXX compiler identification is GNU 5.1.1
        -- Check for working C compiler: /usr/lib64/ccache/cc
        -- Check for working C compiler: /usr/lib64/ccache/cc -- works
        -- Detecting C compiler ABI info
        -- Detecting C compiler ABI info - done
        -- Detecting C compile features
        -- Detecting C compile features - done
        -- Check for working CXX compiler: /usr/lib64/ccache/c++
        -- Check for working CXX compiler: /usr/lib64/ccache/c++ -- works
        -- Detecting CXX compiler ABI info
        -- Detecting CXX compiler ABI info - done
        -- Detecting CXX compile features
        -- Detecting CXX compile features - done
        -- Configuring done
        CMake Error at CMakeLists.txt:5 (add_executable):
              Cannot find source file:
                DisplayImage.cpp
          Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
          .hxx .in .txx
    -- Generating done
    -- Generating done
    -- Build files have been written to: /home/doliveira/Documentos/OpenCV_tests

There is some problem with CMake or OpenCV instalation?

Some info: cmake version 3.2.2 and OpenCV 3.0.0

Thank you