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https://librecad.readthedocs.io/en/latest/about/
Since QCad CE was built around the outdated Qt3 library, it had to be ported to Qt4 before additional enhancements. Porting the rendering engine to Qt4 proved to be a large task, so initially LibreCAD, the 1.0.0 series, still depended on the Qt3 support library.
https://doc.qt.io/archives/qt-4.8/porting4.html
Some properties have been removed from Qt 4, but the associated access functions are provided if QT3_SUPPORT is defined to help porting to Qt 4. When converting Qt 3 UI files to Qt 4, uic generates calls to the Qt 3 compatibility functions. Note that this only applies to the properties of the Qt3Support library, i.e. QT3_SUPPORT properties of the other libraries must be ported manually when ...
Porting the rendering engine to Qt4 proved to be a large task, so LibreCAD initially still depended on the Qt3 support library. The Qt4 porting was completed eventually during the development of 2.0.0 series, thanks to our master developer Rallaz, and LibreCAD has become Qt3 free except in the 1.0.0 series.
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