How do you prevent Hudson from deleting the source tree after a build?

I have several projects that I check out from SVN, some have to be built by ant before the others. I've 开发者_JS百科assigned each project to a job. proj A proj B

In order for B to build, A has to be already built. So, how do tell hudson to not delete A after it checks it out and build it?

It shouldn't remove the build, unless you are a bit too severe on the "Discard Old Build" settings: