I have built Unix/Linux stuff from the 1990s with no code changes. Programs that do well defined things generally have a long shelf life. Even X stuff often wor

I have built Unix/Linux stuff from the 1990s with no code changes. Programs that do well defined things generally have a long shelf life. Even X stuff often works, though it can look bad on modern displays. Math kernels, codecs, and so forth can more or less live forever.