[javac] Compiling 1 source file to /run/media/bothner/MyPassport2/JWebNode/jfx/rt/javafx-ui-controls/build/classes
    [javac] warning: [options] bootstrap class path not set in conjunction with -source 1.6
    [javac] /run/media/bothner/MyPassport2/JWebNode/jfx/rt/javafx-ui-controls/src/javafx/scene/control/TreeUtil.java:86: error: incompatible types: no instance(s) of type variable(s) T exist so that TreeItem conforms to TreeItem<T>
    [javac] TreeItem<T> result = getItem(child, idx ,treeItemCountDirty);
    [javac] ^
    [javac] where T is a type-variable:
    [javac] T extends Object declared in method <T>getItem(TreeItem<T>,int,boolean)
    [javac] Note: /run/media/bothner/MyPassport2/JWebNode/jfx/rt/javafx-ui-controls/src/javafx/scene/control/TreeUtil.java uses unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 1 error
    [javac] 1 warning

The attached TreeUtil.patch appears to fix the problem.