YDL uses X11 from X.org

[Joseph E. Sacco, Ph.D.]

YDL does use the distribution from X.org:

	 xorg-x11-0.0.6.6-0.0.2004_03_11.9.ydl.1.src.rpm

I queried the X server, which is where I got the XFree86 info. Hmm...
When all else fails check to see which packages are installed [:-)].

Anyway,  fedora has a source package for the latest release:

	xorg-x11-6.8.1-22.src.rpm

So I explore that package.


-Joseph

-- 
Joseph E. Sacco, Ph.D. <joseph_sacco at comcast.net>