Posted by ravas on
URL: https://forum.librecad.org/Error-on-creating-a-plugin-sub-MyPluginName-make-first-Error-2-tp5714133p5714136.html

Interesting... :-]

A plugin does seem logical in this case.

My recommendation is to understand the Qt system independent of LibreCAD.
This is a minimal and clear tutorial:
http://doc.qt.io/qt-5/qtwidgets-tools-echoplugin-example.html

You could use qc_plugininterface.h / document_interface.h
or write a new more specific interface.