> [/tmp] martin@night-porter > g++ hello.cc 

That's just what I did, except that my prompt didn't say
"@night-porter" and the source file name was hello.cpp. Note that your
iostream.h is special. Mine isn't. I bet the problem is that I didn't
remove all the NetBSD 1.6.1 header files when I installed comp.tgz
from -current.

Will you look at that. I deleted a whole stash of old include files
and now it all works.

Thanks Martin.