There is a "proof of concept" virus in the wild that can infect systems that have a copy of Delphi installed.
If you don't have a copy of Delphi itself, this virus can't do anything or spread. And it can only infect certain versions of Delphi, at that.
It seems this virus has been around quite awhile (at least a few years), without anyone knowing about it because the payload is more or less harmless, even if you do have Delphi installed.
It won't infect other Delphi apps, just Delphi itself, and then get compiled into every app the developer compiles with his infected Delphi installation. Other than that, it doesn't do anything else, and what it does isn't entirely malicious beyond leaving a calling card all over the place. The goal of this virus seems to just be to leave it's mark (an "i was here") in as many Delphi apps as possible.