Build fail: Do not define STAGEDIR in command line

[nano]

Trying to build ports with "portmaster -f" after
upgrading to 10.0-RELEASE results in build error:

===>  $PORTNAME Do not define STAGEDIR in command line.
*** Error code 1

Stop.
make: stopped in /usr/ports/$PORTSCATEGORY/$PORTSDIR


All ports with "NO_STAGE=yes" in $PORTSDIR/Makefile are failing with the 
above error.

What's the solution? Thanks.

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syn.bsdbox.co