Bennett Todd has just alerted me of some problems with the new release. In short: the build process seems not to work at all (nor does the install do).
This is actually a documentation issue. The way of compiling rsyslog has changed slightly but importantly. You need to CD into an distribution-specific subdirectory (use linux of in doubt) and then call make. Do NOT do this in the root directory of the rsyslog project.
It's documented here