Sorry for the trouble.

Not sure if this is a slackware specific problem or not. Just upgraded
to 10.2. After recompiling and running gtk-gnutella as a non-root user
I get:

fermi@none:~/gtk-gnutella-0.96.1/src$ ./gtk-gnutella
06-07-24 01:05:31 (MESSAGE): language code: "en"
06-07-24 01:05:31 (MESSAGE): using locale character set "ISO-8859-1"
06-07-24 01:05:31 (MESSAGE): primary filename character set "UTF-8"
06-07-24 01:05:31 (MESSAGE): additional filename character set
"ISO-8859-1"
06-07-24 01:05:31 (MESSAGE): gtk-gnutella/0.96b (2005-11-22; GTK1;
Linux i686)
06-07-24 01:05:31 (WARNING): cannot open display:

This worked fine on 10.1 after "xhost +localhost". Can't find anything
in the logs and there's no debug switch for gtk-gnutella.

Thanks for any help, hints, suggestions for further reading, etc..