kdebase problem: Library files for 'xxxx.la' not found in paths

Hello, I sucessfully built kdebase from SVN. When packaging with default RHEL options, the desktop is unusable, it starts but many program do not run (kwin ...). $ kwin KWin: No window decoration plugin library was found. KWin will now exit... When clicking "my computer" icon, a popup appears: There was an error loading the module Navigation Panel. The diagnostic is: Library files for "konq_sidebar.la" not found in paths. After stracing kwin, I found that it was trying to access a file 'kwin3_plastik.la' in many paths, but *all* of them prefixed with "lib". (e.g: /opt/trinity/lib/kwin3_plastik.la ...) But in my build, the TDE libraries are installed under /opt/trinity/lib64 . (this is the RHEL/Fedora default on x86_64) I do not have a directory /opt/trinity/lib at all. If I symlink "lib" to "lib64", everything works. If I build directly under /opt/trinity/lib , everything works too (of course). Why does TDE use "lib" directory, since I compiled for "lib64" ? Is there a trick to change this ? (environment variable at runtime ? cmake configuration flag ?) Thanks Francois Andriot