libQGLViewer | libQGLViewer is an open source C++ library based on Qt | Graphics library

You are not using the right QGLVIewer. CGAL_USE_BASIC_VIEWER is only required in the CGAL implementation of libQGLViewer, that is only supposed to be used in CGAL graphical stuff. Check you paths and avoid the ones containing CGAL.

There must be something wrong with Qt version 5.10.1. I don't know what exactly it is, but there is no such problem with Qt version 5.9.4. Everything is fine with 5.9.4.

One must add:

• Qt5Core.dll
• Qt5Gui.dll
• Qt5Widgets.dll
• Qt5Xml.dll

Firts one, target_include_directories() has following syntax according official docs target_include_directories( [SYSTEM] [BEFORE] [items1...] [ [items2...] ...]) as you see there few keywords might be used:

• PRIVATE: adds directories to INCLUDE_DIRECTORIES property of
• INTERFACE: adds directories to INTERFACE_INCLUDE_DIRECTORIES property of
• PUBLIC: adds directories to INCLUDE_DIRECTORIES and INTERFACE_INCLUDE_DIRECTORIES properties of

What about those properties:

• INCLUDE_DIRECTORIES - contains list of directories to search header files you used in project
• INTERFACE_INCLUDE_DIRECTORIES - contains list of directories to search header files too, but it has transitivity, that means you able to inherit your include directories to project linked through target_link_libraries()

Second one, your code doesn't work because you are using another include folders paths, your source file must be contain something like #include but since you do not include root folder anymore (. in your previous code), but linking QGLViewer directly - you must type #include . Fix it for each #include you are using or add ${PROJECT_SOURCE_DIR} to target_include_directories instead.