hi gene,
in pkgsrc-current, PKGSRC_USE_SSP=yes and PKGSRC_USE_FORTIFY=yes
became the default values. so we will attempt to pass -fstack-protector.
It's possible it was broken on netbsd-6.
It's possible your version of gcc48 was broken, I had to change it to
allow -fstack-protector to work. although it failed differently. Using
the latest eliminates this question.
And it's possible a few packages were broken for everyone with
SSP/FORTIFY.