Undefined reference to object. Possible wrong implementation?

Look at your compiler output the first few lines show you are compiling cardwidget. Cpp, cardwindow. Cpp and main.cpp.

There is no corresponding line for CardDeck.cpp. (As well as what I assume are some mocked versions for unit testing) . The make file you posted showed no references to these files.

I am no make expert but I suspect the makefile you posted is including another file (possibly the MAKEFILE=Makefile) that you did not include. Look into your project files and see if you can find the file that is specifying the above files, typically as I remember Makefiles there should be something like.

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