Heya,
Have rebuilt and released a set of Flow-tools RPMs for Redhat Enterprise 4ES.
RPM here: http://www.seekbrain.com/downloads/rpms/4ES/flow-tools-0.68-1.i386.rpm
SRPM here: http://www.seekbrain.com/downloads/srpms/4ES/flow-tools-0.68-1.src.rpm
Only changes from the released Flow-tools is a minor patch to fix Python paths (from /usr/local/bin/python to /usr/bin/python).
Stuart