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Thread: Cgal 5.2.1

  1. #1
    Join Date
    May 2021
    Beans
    3

    Cgal 5.2.1

    Hi! I am using Ubuntu 20.04 LTS and I am trying to get CGAL-5.2.1 running. I followed the instructions on:

    https://doc.cgal.org/latest/Manual/installation.html

    cd $HOME/CGAL-5.2.1
    mkdir build
    cd build
    cmake -DCGAL_HEADER_ONLY=OFF -DCMAKE_BUILD_TYPE=Release .. # configure CGAL
    make # build CGAL
    make install # install CGAL
    cd examples/Triangulation_2 # go to an example directory
    cmake -DCGAL_DIR=$CMAKE_INSTALLED_PREFIX/lib/CGAL -DCMAKE_BUILD_TYPE=Release . # configure the examples
    make # build the examples

    Everything is fine but when I run draw_Triangulation_2, I get the following error message:

    Impossible to draw, CGAL_USE_BASIC_VIEWER is not defined.



    Then, I follow the instructions on this thread

    https://stackoverflow.com/questions/...is-not-defined

    and put the line

    #CGAL_USE_BASIC_VIEWER

    at the top of the file, run the Makefile again and receive the following error messages:

    [ 84%] Building CXX object CMakeFiles/draw_triangulation_2.dir/draw_triangulation_2.cpp.o
    In file included from /usr/local/include/CGAL/draw_triangulation_2.h:16,
    from /home/srsouza/Dropbox/Valmir/Progs/Gastrulation/CGAL-5.2.1/examples/Triangulation_2/draw_triangulation_2.cpp:5:
    /usr/local/include/CGAL/Qt/Basic_viewer_qt.h:30:10: fatal error: QApplication: No such file or directory
    30 | #include <QApplication>
    | ^~~~~~~~~~~~~~
    compilation terminated.
    make[2]: *** [CMakeFiles/draw_triangulation_2.dir/build.make:63: CMakeFiles/draw_triangulation_2.dir/draw_triangulation_2.cpp.o] Error 1
    make[1]: *** [CMakeFiles/Makefile2:689: CMakeFiles/draw_triangulation_2.dir/all] Error 2
    make: *** [Makefile:84: all] Error 2



    Could anyone help me? Thanks!
    Last edited by srsouza; May 29th, 2021 at 09:55 AM.

  2. #2
    Join Date
    Jan 2017
    Beans
    209

    Re: Cgal 5.2.1

    Try adding "-DCGAL_USE_BASIC_VIEWER" to your cmake line for the triangulation_2 example:
    Code:
    cmake -DCGAL_DIR=$CMAKE_INSTALLED_PREFIX/lib/CGAL -DCMAKE_BUILD_TYPE=Release -DCGAL_USE_BASIC_VIEWER .
    Works fine on 21.04 which has CGAL-5.2.1 in the repros. If you need 5.2.1 you might consider upgrading. https://packages.ubuntu.com/hirsute/libcgal-dev
    Code:
    ~/Downloads/cgal/examples/Triangulation_2/build$ ldd draw_triangulation_2 | grep Qt
        libQt5OpenGL.so.5 => /lib/x86_64-linux-gnu/libQt5OpenGL.so.5 (0x00007ff5fcfd3000)
        libQt5Svg.so.5 => /lib/x86_64-linux-gnu/libQt5Svg.so.5 (0x00007ff5fcf76000)
        libQt5Widgets.so.5 => /lib/x86_64-linux-gnu/libQt5Widgets.so.5 (0x00007ff5fc8d6000)
        libQt5Gui.so.5 => /lib/x86_64-linux-gnu/libQt5Gui.so.5 (0x00007ff5fc206000)
        libQt5Xml.so.5 => /lib/x86_64-linux-gnu/libQt5Xml.so.5 (0x00007ff5fc1c1000)
        libQt5Core.so.5 => /lib/x86_64-linux-gnu/libQt5Core.so.5 (0x00007ff5fbc67000)

  3. #3
    Join Date
    May 2021
    Beans
    3

    Re: Cgal 5.2.1

    Thanks for the reply with the detailed instructions. However, it did not work for me. I still have the same error message and when I run ldd I get:


    linux-vdso.so.1 (0x00007ffd73bb9000)
    libCGAL.so.13 => /usr/local/lib/libCGAL.so.13 (0x00007f8db0f84000)
    libgmp.so.10 => /lib/x86_64-linux-gnu/libgmp.so.10 (0x00007f8db0eed000)
    libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f8db0d0c000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f8db0cf1000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8db0aff000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f8db0fac000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f8db09b0000)


    It seems that Qt5 is not installed, but I checked that they are indeed. Any further suggestions?

  4. #4
    Join Date
    Jan 2017
    Beans
    209

    Re: Cgal 5.2.1

    Quote Originally Posted by srsouza View Post
    /usr/local/include/CGAL/Qt/Basic_viewer_qt.h:30:10: fatal error: QApplication: No such file or directory
    30 | #include <QApplication>
    | ^~~~~~~~~~~~~~
    compilation terminated.
    The above indicates that the compiler can't locate the Qt5 header files.

    Do you have qtbase5-dev installed? https://packages.ubuntu.com/focal/qtbase5-dev

  5. #5
    Join Date
    Aug 2013
    Beans
    4,697

    Re: Cgal 5.2.1

    cgal has a lot of options, instead using cmake to confiigure, use the cmake gui, inside the build directory

    Code:
    ccmake ..

    then you can see all the options and toggle to activate them. This way you get more legible feedback.

  6. #6
    Join Date
    May 2021
    Beans
    3

    Re: Cgal 5.2.1

    Thanks for the reply. I finally got it working, although through a noncanonical path...

    I installed:

    1) debian10.9,
    2) anaconda3 (open source)
    https://www.anaconda.com
    3) The libraries: libqt5opengl5-dev libgmp-dev libmpfr-dev libboost-dev libeigen3-dev libqt5opengl5-dev

    and it finally worked!

    Thank you all for the help.

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