I have downloaded and built qwt-6.2.0 and installed it in /usr/local/qwt-6.2.0/
I have verified that the Qwt installation is sound by compiling and running the exampled provided, using Qt Creator 9.02.
qmake --version reports Qt version 5.15.3, which I believe is the version Kubuntu 22.04 is built on.
I am trying to use Qwt as part of a program built with Qt6, using KDevelop / cmake, but I have not been able to configure CMakeLists.txt correctly.
I have found several discussions of this issue, but suspect that they might be deprecated. Anybody that knows about an up to date CMakeLists.txt for Qwt?