Version 4.21 is available upstream. Please consider updating!
It seems that version 4.21 is available upstream, while the latest version in the Gentoo tree is 4.10. You think this warning is false? Read more about it here.
SWT is the software component that delivers native widget functionality for the
Eclipse platform in an operating system independent manner. It is analogous to
AWT/Swing in Java with a difference - SWT uses a rich set of native widgets.