QWT plugin into QT Designer specified module could not be found

[DSpider]

I am trying to use QWT plugin within QT Designer. I followed all the doc steps, I compiled the plugin and modified the PATHs as follows:

PATH=C:\Qwt-6.1.3\lib
QT_PLUGIN_PATH=C:\Qwt-6.1.3\plugins
QMAKEFEATURES=C:\Qwt-6.1.3\features

However, when I launch QT Creator, the plugin could not be loaded correctly. I get the message:

Can not load library .... The specified module could not be found.
I don't see where the problem can be.

Any help will be more than appreciated.

[mrjj]

Hi and welcome to the forums
You compiled it with same compiler as Creator and in Release mode ?

[DSpider]

@mrjj thank you for your answer.

I used the same compiler (MSVC2015) as the one used to compile as shown in the pic.

The config file in windows says that both debug & release modes are compiled. Should I changed it to the release only ?

win32 {
    # On Windows you can't mix release and debug libraries.
    # The designer is built in release mode. If you like to use it
    # you need a release version. For your own application development you
    # might need a debug version. 
    # Enable debug_and_release + build_all if you want to build both.

    CONFIG           += debug_and_release
    CONFIG           += build_all
}

[jsulm]

@DSpider Did you use same Qt version also?

[DSpider]

@jsulm Not sure how to do this. Do I need to specify it in the qwt.build ?

I have now another problem when trying to compile with nmake.

......\Qt\5.11.2\msvc2015\include\QtCore\qglobal.h(45): fatal error C1083: can not open file include : 'type_traits' : No such file or directory

I saw that I should specify in the .build file to use c++11 which I did, the problem persists.

Can this be related to the Qt version ?

Best regards

[DSpider]

I finally managed to compile it.
Just by executing VsVars32.bat before compilation, this is supposed to load environment variables. I followed this answer.

Thank you all for your help.

[Pablo J. Rogina]

@DSpider great! please don't forget to mark your post as solved. Thanks.