Portupgrade install errors

[Andreas Wideroe Andersen]

I can't seem to install portupgrade on my system. I'm running 4.7 
STABLE (and I can't upgrade until later in July).

/usr/ports/sysutils/portupgrade #] make install clean
"/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

Any idea?

Thanks,
Andreas