To compile successfully on Ubuntu (tested on 18.04) you need to change -lqwt to -lqwt-qt5 in src/src.pro.
This is because the qt5 version of qwt has a different name so both can be installed at the same time.
If not changed either the linker cannot find -lqwt, or even worse, if libqwt-dev is installed it will link qloud with the qt4 version and give a segfault on startup.
To compile successfully on Ubuntu (tested on 18.04) you need to change
-lqwtto-lqwt-qt5in src/src.pro.This is because the qt5 version of qwt has a different name so both can be installed at the same time.
If not changed either the linker cannot find -lqwt, or even worse, if libqwt-dev is installed it will link qloud with the qt4 version and give a segfault on startup.