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I followed these instructions in the configuration of OpenCV SDK for using it in Qt Creator IDE, but I couldn't conclude point 6.5, due to configuration errors in Cmake-GUI. I setup the configuration in CMake of the compilers gcc and g++ contained in Qt folder for MinGW32, and all looks Ok. But when Cmake-GUI starts the process of build configuration it ends up saying

"Error in configuration process, project files may be invalid".

It can't find the following:

  • QT_QMAKE_EXECUTABLE;
  • Qt5Concurrent_DIR;
  • QT5Core_DIR;
  • QT5Gui_DIR;
  • QT5Test_DIR;
  • QT5Widgets_DIR.

After this issue I tried to go on with following points of configuration tutorial, without reaching the final instruction of mingw32-make install. I'm using the following versions of softwares: Qt 5.3.0, OpenCV 2.4.9, CMake 2.8.12.2. My OS is Windows 7.

How can I recover the missing Qt files in CMake configuration? Is there an alternative way for configuring OpenCV with Qt (like using precompiled build of OpenCV libraries)?

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5
  • How is CMake called? Have you passed the QT5Core_DIR? Commented May 28, 2014 at 13:16
  • I just tried to locate the files manually into the QT folders, now I'm waiting the result of mingw32-make instruction on cmd prompt... and then mingw32-make install has to work, this last step never worked before. I'll post soon the result. Commented May 28, 2014 at 14:42
  • It's ok, it is working now! Commented May 29, 2014 at 13:36
  • Great, does this include running "make install" from your old original question? I created an answer below, please accept it. Commented May 29, 2014 at 17:01
  • Yes, I concluded the whole configuration, now openCV works with QT Creator. Commented May 29, 2014 at 20:47

2 Answers 2

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8

You just need to indicate CMake the correct paths to each one. Click oh the path to browse and set each one individually:

  • QT_QMAKE_EXECUTABLE; For this one, you need to search inside the Qt installation folder for the /bin directory. On it, you' ll find the qmake.exe. In my case it was C:/Qt/5.3/winrt_x64/bin/qmake.exe

    All the following ones are in the Qt's /lib/cmake directory. In my case: C:/Qt/5.3/winrt_x64/lib/cmake :

  • Qt5Concurrent_DIR;
    C:/Qt/5.3/winrt_x64/lib/cmake/Qt5Concurrent

  • QT5Core_DIR;
    C:/Qt/5.3/winrt_x64/lib/cmake/Qt5Core

  • QT5Gui_DIR;
    C:/Qt/5.3/winrt_x64/lib/cmake/Qt5Gui

  • QT5Test_DIR;
    C:/Qt/5.3/winrt_x64/lib/cmake/Qt5Test

  • QT5Widgets_DIR.
    C:/Qt/5.3/winrt_x64/lib/cmake/Qt5Widgets

Then click generate. It' ll show a new error and ask you for the QT5OpenGL_DIR. Just as before, show CMake the correct directory. In my case: C:/Qt/5.3/winrt_x64/lib/cmake/Qt5OpenGL. Finally, click Configure again, and then Generate, and now you're done creating the build files.

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1 Comment

thank you so much life-saver! this should be the accepted answer.
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You have to specify the location of Qt manually by passing it as an argument for QT5Core_DIR. Qt5_DIR or CMAKE_PREFIX_PATH does also the trick.

Example
Given your Qt 5 is installed at /opt/selfcompiled/Qt5. When calling cmake, add the flag from above:

cmake -DQt5_DIR=/opt/selfcompiled/Qt5 <pathToSourceDir>

Once the Qt 5 directory is set and found by CMake, all the other variables related to Qt 5 should be found from there, too.

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This answer is not precise enough. Please specify the steps needed.

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