The following packages will be installed:
 rxtx 
Fetching README...  0%100%100%100%100%100%Done
Fetching destdir.patch...  0%100%100%100%100%100%Done
Fetching im-20090910.patch...  0%100%100%100%100%100%Done
Fetching rxtx.SlackBuild...  0%100%100%100%100%100%Done
Fetching rxtx.info...  0%100%100%100%100%100%Done
Fetching slack-desc...  0%100%100%100%100%100%Done
Fetching ttyACM_port.patch...  0%100%100%100%100%100%Done
JDK does not appear to be installed; exiting...
fakeroot -- sh rxtx.SlackBuild Failed