xtrans-dev 1.0.4-1 (amd64 binary) in ubuntu intrepid

 xtrans includes a number of routines to make X implementations
 transport-independent; at time of writing, it includes support for UNIX
 sockets, IPv4, IPv6, and DECnet.
 .
 xtrans is not actually a library in itself; it includes .c files which are
 then used in the compilation of X servers, libraries, et al.
 .
 More information about X.Org can be found at:
 <URL:http://xorg.freedesktop.org>
 <URL:http://lists.freedesktop.org/mailman/listinfo/xorg>