I'm indeed responsible for this myself, because I had enable xdm Authentication:
bash-3.2$ grep -n XdmcpWrap ../../os/* ../../os/xdmauth.c:92: XdmcpWrap (&rho, &privateKey, outgoingData->data, 8); Now I remember that I got the same error when I rebuilt kdm a month ago (which is directly derived from xdm, in contrast to gdm which is a complete [rather buggy and slow] rewrite). This error comes into existance because libXdmcp.so.6 does not export the two symbols XdmcpWrap and XdmcpUnwrap anymore, for some time now: bash-3.2$ nm /usr/X11/lib/libXdmcp.so.6|egrep -e XdmcpWrap -e XdmcpUnwrap|wc -l 0 bash-3.2$ So I apologize for the confusion. -- %martin