KDE 4 installations - Getting KDE 4 software
Can I build KDE software from source?
You can follow the guide found in Techbase - Getting Started.
How do I build KDE software? Where do I go if I encounter build problems?
Guides to building KDE can be found in Techbase - Getting Started. Please read and follow them very carefully. You can ask questions in the usual support channels such as IRC, mailing lists, or forums.