XFree86 releases starting with the 3.1.2D beta are based on the X Consortium's X11R6.1.
R6.1 is an update to R6, and is intended to be compatible with R6 at the source and protocol levels. Binaries should be upward-compatible. X11R6.1 includes some new Xserver extensions: DOUBLE-BUFFER, XKEYBOARD and RECORD. LBX has been dropped from R6.1, and as such, has been dropped from XFree86 too. It is expected that it will reappear in some form in a future release.
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