> I'm not too sure if Jenkins is actually a good choice, just because I > question that there's a working Java especially for old Unix-alike > systems that GCC still (in theory) supports. What about eg. older IRIX > or Ultrix systems? I have no such experience on running jenkins under java runtime on old and legacy systems. In my case, it's exactly focused on such environment which is with modern linux-like systems like Ubuntu. plus, the minimum runtime environment of running jenkins with up-to-date version is java 1.5 or later.
> ...or can you, instead of using the Java-based > client part of Jenkins, issue all commands over a SSH (or maybe even > Telnet...) session? Is there a module for this available? If making jenkins running on target systems you want whether old or modern, then take a look at Jenkins-SSH (https://wiki.jenkins-ci.org/display/JENKINS/Jenkins+SSH) to remotely control over ssh.