[Lazarus] Fatal: Can't find unit system used by Lazarus

[Antonio Fortuny]

Look at the last lines of the messages window

/usr/bin/fpc -Ur -Xs -O2 -n -gl -Sci -dlclgtk2 -Fu../designer 
-Fu../debugger -Fu../debugger/frames -Fu../converter -Fu../packager 
-Fu../packager/frames -Fu../components/custom -Fuframes -Fu. -Fiinclude 
-Fiinclude/linux -Fi../images -FE.. -FU../units/x86_64-linux/gtk2 -Cg 
-Fl/usr/lib64/gcc/x86_64-suse-linux/4.5 -Fl/usr/X11R6/lib64/Xaw3d 
-Fl/usr/X11R6/lib64 -Fl/usr/lib64/Xaw3d -Fl/usr/X11R6/lib/Xaw3d 
-Fl/usr/X11R6/lib -Fl/usr/lib/Xaw3d -Fl/usr/x86_64-suse-linux/lib 
-Fl/usr/local/lib -Fl/opt/kde3/lib -Fl/lib64 -Fl/lib -Fl/usr/lib64 
-Fl/usr/lib -Fl/usr/local/lib64 -Fl/opt/kde3/lib64 -Flinclude 
-Fl/etc/ld.so.conf.d/*.conf @/home/sita/.lazarus/idemake.cfg 
-FU/usr/lib64/lazarus/units/x86_64-linux/gtk2 -FE/usr/lib64/lazarus 
-dx86_64 -dRELEASE lazarus.pp
Fatal: Can't find unit system used by Lazarus

Nowhere any "/usr/lib64/fpc/2.6.0/units/x86_64-linux/rtl/" nor 
"/usr/share/fpcsrc/rtl/units/x86_64-linux/" are named in -Fu

When I submit the compilation line in a shell under myuser I get the 
same error, as well as under root !!