KDE 4 on Solaris came to life today on my Opteron box.

Screenshots of running KDE4 [ kdelibs/kdepimlibs/kdebase-workspace/kdebase-runtime ]:

KDE4Solaris

[ my Smugmug gallery ].

Built with Sun Studio 12, QT 4.3.1 and the Apache Standard C++ Library.

OpenGL/Compositing effects are enabled. I Frankenstein'ed the S10U4 Xorg by
adding a bunch of X Extensions Libraries. I was very bold and enabled

Option "AddARGBGLXVisuals" "True"
Option "AllowGLXWithComposite" "True"

And now the real work begins. :-)