Vitaly Novichkov
Vitaly Novichkov
Not yet, I was focused on other stuff.
What Qt Version is? Lemme try this with the analysis...
Also, what version of Qwt you do have? On my end the 6.1.4 (installed via apt, Linux Mint 21.3, not yet upgraded, I'll upgrade to 22 soon)
On my end the thing was built just fine, and seems the problem in the case if you trying to use Qt 6 or too new Qwt (then I should...
Okay, then I should try that version...
There submodules... you need to pull the repo by release tag and pull submodules then. Anyway, that's fault of GitHub that doesn't packs submodules into release's code
I usually trying to attach the "complete source archive" in addition to prebuilt binaries. But here, seems, I forgot.
Recently I upgraded my Linux Mint distro to 22.1 (from 21.3), however, I didn't debugged the Qwt support well, I should take a shot on this soon. Thanks for reminder!
Okay, when I built thing with Qwt 6.3, then your build failure reproduced: 
Just now I fixed the build with Qwt 6.2+, please test how this works at your end!