Cannot compile many ports because of missing -lsupc++ and -lstdc++

[Mike Jakubik]

Hello,

I am having trouble compiling many ports which fail with one of the 
following errors.

/usr/bin/ld: cannot find -lstdc++
/usr/bin/ld: cannot find -lsupc++

I understand 10 has a new c++ library, but how can I get ports to build 
with this? This is quite frustrating. I am using a fresh install of 
ALPHA4, nothing in make.conf.

Thanks.