Apache build dies on my Freebsd, whats this ?

Checking the fail log from the apache build on a Freebsd 4.7 box I see at the bottom:

""/usr/ports/Mk/bsd.port.mk", line 1618: warning: String comparison operator should be either == or !=
"/usr/ports/Mk/bsd.port.mk", line 1618: Malformed conditional (${OSVERSION} < 504105 || (${OSVERSION} >= 700000 && ${OSVERSION} < 700012) || (${OSVERSION} >= 600000 && ${OSVERSION} < 600104))
"/usr/ports/Mk/bsd.port.mk", line 1618: Missing dependency operator
"/usr/ports/Mk/bsd.port.mk", line 5651: if-less endif
"/usr/ports/Mk/bsd.port.mk", line 5651: Need an operator
make: fatal errors encountered -- cannot continue
make: fatal errors encountered -- cannot continue
Nested quantifiers in regex; marked by <-- HERE in m/^gcc-c++ <-- HERE / at /scripts/ensurepkg2 line 132."

Not sure where to go to fix this, anyone have any ideas ?