If the technology is truly obsolete (though now I'm re-reading this I don't think there's anything that can be truly called obsolete) then just vote to close as "too localized".
This question is unlikely to ever help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet.
However, if it's just an old version of a language, framework etc. then it's not appropriate to close the question at all.
If you don't have enough reputation to close or you think it won't get the other 4 votes in the normal operation of the site, flag it for moderator attention.