Attached is a patch that attempts to remove support for pre 7.x systems. I attempted to test this - but obviously a complete exp-run is required.
Responsible Changed From-To: freebsd-ports-bugs->portmgr bsd.port.mk is portmgr territory (via the GNATS Auto Assign Tool)
State Changed From-To: open->analyzed Take for -exp.
State Changed From-To: analyzed->closed Committed, with minor changes. Thanks!