Slicer build error - ‘class QLatin1String’ has no member named ‘arg’de

Development
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/home/ankit/Slicer/Base/QTGUI/qSlicerExtensionsLocalWidget.cxx: In member function ‘void {anonymous}::qSlicerExtensionsDescriptionLabel::labelText(const QString&)’:
/home/ankit/Slicer/Base/QTGUI/qSlicerExtensionsLocalWidget.cxx:431:84: error: ‘class QLatin1String’ has no member named ‘arg’
431 | g style="float: left" src=":/Icons/ExtensionIncompatible.svg"/> ").arg(this->WarningColor) +
| ^~~

make[5]: *** [Base/QTGUI/CMakeFiles/qSlicerBaseQTGUI.dir/build.make:1269: Base/QTGUI/CMakeFiles/qSlicerBaseQTGUI.dir/qSlicerExtensionsLocalWidget.cxx.o] Error 1
make[4]: *** [CMakeFiles/Makefile2:9810: Base/QTGUI/CMakeFiles/qSlicerBaseQTGUI.dir/all] Error 2
make[3]: *** [Makefile:163: all] Error 2
make[2]: *** [CMakeFiles/Slicer.dir/build.make:143: Slicer-prefix/src/Slicer-stamp/Slicer-build] Error 2
make[1]: *** [CMakeFiles/Makefile2:196: CMakeFiles/Slicer.dir/all] Error 2
make: *** [Makefile:95: all] Error 2

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That’s from using an older version of Qt, since that method was introduced in 5.14. Updating to 5.15 is recommended.