net-p2p/deluge-1.2.3 compiled just fine and after one month of permanent usage, I had no crash or other problems so far on my UltraSparc Blade 100 server. I only used the console and web interface, as those are the only ones possible. net-p2p/deluge-1.2.3 was built with the following: USE="(multilib) webinterface -gtk -libnotify" CFLAGS="-O2 -mcpu=ultrasparc -mtune=ultrasparc -pipe" CXXFLAGS="-O2 -mcpu=ultrasparc -mtune=ultrasparc -pipe" LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,--no-as-needed"
sparc done, closing.