KDE on Solaris
Solaris (and OpenSolaris) are Free Software operating systems released under the CDDL by Sun Microsystems. They are vaguely BSD-like. KDE4 runs on this operating system.
The KDE Project on the OpenSolaris site is intended to be the definitive source of information, but this page on TechBase is intended to collect information, porting and compilation guides, etc. Since TechBase is a wiki, this is much easier than going through the OpenSolaris editing process.