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In page Xfce:

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Fourdan continued developing the project and in 1998, Xfce 2 was released with the first version of Xfce's window manager, Xfwm. He requested to have the project included in Red Hat Linux, but was refused due to its XForms basis. Red Hat only accepted software that was open source and released under either a GPL or BSD compatible license, whereas, at the time, XForms was closed source and free only for personal use.[1] For the same reason, Xfce was not in Debian before version 3, and Xfce 2 was only distributed in Debian's contrib repository.[2]