PostgreSQL Programmer's Guide Prev Appendix DG1. If you would like to keep up with the current sources on a regular basis, you can fetch them from our CVS server and then use CVS to retrieve updates from time to time.
Many systems have a recent version of cvs installed by default.
You should only need to do this once, since the password will be saved in .cvspass in your home directory. But on a modem-speed link, it's a very substantial win. The advantage of CVS doesn't show up until you want to update the file set later on. This will fetch only the changes since the last time you updated. You can update in just a couple of minutes, typically, even over a modem-speed line.