GTK3 on linux

[osvegn]

Some recent update has been done with Lazarus about gtk3.
Let's try GTK3 on Linux for OpenRSAT

[osvegn]

Linux-x64 with LCLWidgetType:=gtk3:
(OpenRSAT:2915): Gtk-ERROR **: 16:23:54.662: GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported

[staeglis]

We build this with Qt5. Works good.

[osvegn]

Even after fixing compilation issues, GTK3 is not yet well supported on linux. I might switch the compilation to QT5 on releases.

[synopse]

Upcoming Lazarus 5 will switch to GTK3 by default.
A lot of work has been done to make it stable.

Thanks https://gitlab.com/zeljan1 for his great work!

Since 02.07.2026 Gtk3 is the default linux widgetset in lazarus trunk !