@Conical The INCLUDEPATH seems to be correct. At least what you are showing. I do not know the test library feature of boost. However, I know that some features require separate compilation which will create libraries. This would be for the regular expression of boost for instance. Those libraries need to be referenced with LIBS statement. https://doc.qt.io/qt-5/qmake-variable-reference.html#libs

It is boost library issue. Looks like you are not using the capture method of boost properly . Look at some examples of boost and fix your issue.

@nour.m if you mean here: http://freetexthost.com/l5wzgtntzb than no, you did not make the changes @aha_1980 told you to do SOURCES += main.cpp mainwindow.cpp my_polyhedron.cpp myqglwidget.cpp HEADERS += mainwindow.h My_CGAL_Config.h My_Face_base.h My_Halfedge_base.h my_polyhedron.h My_Vertex_base.h myqglwidget.h still mising \ at the end of the line also you are adding the widgets module twice. I'm not sure in what that will result, but you should remove one QT += core gui QT += widgets //remove me DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x000000 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

Did you try to run your application through debugger to see why it crashes? Any error messages?

@SGaist heh – I must be receiving your comments telepathically – I just "discovered" that a few minutes before seeing your comment. thanks!

For b, check whether the library has other dependencies. You might be missing one.

Hi, library naming is something OS related (for instance the filename for a dynamic library called foo on Windows with Visual Studio will be foo.dll, on Linux libfoo.so, on OS X libfoo.dylib). For this reason when you pass the library name to the linker you have to omit the prefix (ususally lib) and the extension. NOTE in case of MinGW you'll have the naming conventions used in Linux/Unix (lib<library_name>.<extension>)