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In addition, the following files need to be downloaded and placed in "open-jfx/lib":
Certain parts of JFX, e.g. JavaFX/SWT classes in rt/javafx-embed-swt, depend on SWT being available at compile time. Environmental variable SWT_DIR or ant property swt.path can be used to specify a directory with swt.jar. If neither SWT_DIR nor swt.path are specified, no classes that depend on SWT are built. TODO: does it make sense to look for swt.jar in open-jfx/lib as well?
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