diff -Nuar a/src/Gui/Utils/Widgets/Slider.cpp b/src/Gui/Utils/Widgets/Slider.cpp
--- a/src/Gui/Utils/Widgets/Slider.cpp	2020-05-16 20:23:33.000000000 +0300
+++ b/src/Gui/Utils/Widgets/Slider.cpp	2020-09-28 13:52:47.902512239 +0300
@@ -25,6 +25,7 @@
 
 #include <QPainter>
 #include <QMouseEvent>
+#include <QPainterPath>
 
 using Gui::Slider;