qmllint doesn't understand QColor

Running qmlling in a project that exposes a QColor property gives out the following warning

Warning: /Users/user/untitled1/main.qml:19:9: No type found for property "color". This may be due to a missing import statement or incomplete qmltypes files. [missing-type]
        color: root.myColor
        ^^^^^
Warning: /Users/user/untitled1/main.qml:23:18: Type "QColor" of property "color" not found. This is likely due to a missing dependency entry or a type not being exposed declaratively. [unresolved-type]
        text: mo.color
                 ^^^^^

I'm attaching the simple project to reproduce the problem.

Just run

make && make all_qmllint