I installed tripwire OK on various FC4 machines using the binary RPM available via yum at the extras depository. Naturally, you will need to select the actual files you want to watch in the configuration files as suits your system & applications, and then run the sundry initialization commands...
Try 'yum search tripwire' which should return
tripwire-2.3.1-22.i386.rpm
cheers
Jim Hughes Cerro Tololo Interamerican Observatory