It no longer starts from the GUI menu.
From the CLI:
ron@localhost:~ $ bagpipe
bagpipe: error while loading shared libraries: libX11.so.6: cannot open shared object file: No such file or directory
And yet:
ron@localhost:~ $ ls /usr/libX11.so*
/usr/libX11.so.6 /usr/libX11.so.6.4.0
ron@localhost:~ $ ls /usr/lib64/libX11.so.6*
/usr/lib64/libX11.so.6 /usr/lib64/libX11.so.6.4.0
Any idea ?