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Depending on your project and constraints, you will have to use an older version of Qt that supports that outdated version of Visual Studio. I would first check with LDRA to ensure with them that their tools can be used with more recent versions of Visual Studio.

@JonB Exactly, downloaded libusb version for mingw 64 and now it's working.
Thank u guys for support.

Did you manage to compile qwt for iOS?

@JoeCFD I was able to find an answer to this question by doing this:

find_package(PkgConfig REQUIRED)
pkg_check_modules(ZBar REQUIRED IMPORTED_TARGET zbar)
target_link_libraries(camera PUBLIC PkgConfig::ZBar)
Since I anyway had pkg-config, I found that package and then zbar using that package and then linked it with the libraries.

This thread on the OpenFrameworks forum might help.

I found the problems:
I forgot to include the libraries hdf5_hl
hdf5_hl_cpp and hdf5_hl

I had 2 versions of hdf5 installed: 12.2 and 14.0

I had to uninstall 12.2.
Now, it seems to work.

Thanks to all.

Was able to resolve it by adding LIBS += -lWindowsApp to *.pro file.

Thread can be closed.

@SGaist Great Thank you this, I know that qt has its own MQTT module just I had already developed my code for MQTT using the mosquitto library before I knew I was going to be making a GUI using QT.

Fixed the issue.

Turns out it was something with my laptop. I had gotten a secondary laptop that had the same environment, all Windows 10, downloaded the NIDAQmx software, and it connected to my Qt application perfectly fine. Very odd, unsure why this happened. I went about the installation process the same on both laptops.

I hope nobody ever has to go through this issue again, but if you are, might want to try on a new laptop..Worked for me!

@Schloern
To run ros packages, it is necessary to run the setup.bash file, for example, the setup.bash file should be run in the linux operating system.

Start the QT Creator application in the terminal where you enter the setup.bash controls.

step 1: Open terminal and enter "source /opt/ros/humble/setup.bash" command. Note: this is ros humble enter your own setup.bash file
step 2: Open the QT Creator application from the terminal you included ros2
step 3: If you want to work simultaneously with ROS, use threads.

@Neptunus
I would expect these to be resolved by linking with kernel32.lib? Compare the linker lines generated from VS vs Creator? I don't know what Win32_Interop.lib is.

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Hey Can you help me how to enable the MSVC compiler , I couldnt choose it.

I found out while replying to your response that I tried to install with qmake at location "C:/Qt/5.15.2/mingw81_64/bin". Instead I changed path variable of qmake to location "C:/Qt/5.15.2/android/lib". Now it compiled. Thank you for your help @SGaist . :D

@CutiUser said in Error "symbol lookup error", "undefined symbol: SSLv3_client_method" using libQtNetwork.so.4:

I guess I can't get openssl v1.1.1 and v1.1.0 to work together...

That actually should work as version number is usually part of the library name or symbolic link.
I think Qt4 never supported LibSSL 1.1

@jsulm said in QT 5.12.11 add mng support:

Then please check the config.log file - probably something is missing (some library), so it is disabled.

Thank you for your advice. Finally , I found the disable configuration is in "/src/imageformats/configure.json" , change the mng condition to features.imageformatplugin ,this works.

@Chris-Kawa

The doc also says that you need to define FTD2XX_STATIC if you're using the static library.

I read this in the documentation, but tried to define into the source code. After you mentioned that I put

into the .pro file and that is works.

Thank you all for help.

Hello ramcho,

I have the same problem, did you find a solution to solve it ?